diff --git a/include/musique.hh b/include/musique.hh
index 70041ce..3a88d96 100644
--- a/include/musique.hh
+++ b/include/musique.hh
@@ -833,14 +833,15 @@ struct Value
 	/// Using Explicit_Bool to prevent from implicit casts
 	static Value from(Explicit_Bool b);
 
-	static Value from(Number n);           ///< Create value of type number holding provided number
-	static Value from(std::string s);      ///< Create value of type symbol holding provided symbol
-	static Value from(std::string_view s); ///< Create value of type symbol holding provided symbol
-	static Value from(char const* s);      ///< Create value of type symbol holding provided symbol
-	static Value from(Block &&l);          ///< Create value of type block holding provided block
-	static Value from(Array &&array);      ///< Create value of type array holding provided array
-	static Value from(Note n);             ///< Create value of type music holding provided note
-	static Value from(Chord chord);        ///< Create value of type music holding provided chord
+	static Value from(Array &&array);              ///< Create value of type array holding provided array
+	static Value from(Block &&l);                  ///< Create value of type block holding provided block
+	static Value from(Chord chord);                ///< Create value of type music holding provided chord
+	static Value from(Note n);                     ///< Create value of type music holding provided note
+	static Value from(Number n);                   ///< Create value of type number holding provided number
+	static Value from(char const* s);              ///< Create value of type symbol holding provided symbol
+	static Value from(std::string s);              ///< Create value of type symbol holding provided symbol
+	static Value from(std::string_view s);         ///< Create value of type symbol holding provided symbol
+	static Value from(std::vector<Value> &&array); ///< Create value of type array holding provided array
 
 	enum class Type
 	{
@@ -1094,4 +1095,8 @@ static constexpr bool is_callable(Value::Type type)
 	return type == Value::Type::Block || type == Value::Type::Intrinsic;
 }
 
+/// Flattens one layer: `[[[1], 2], 3]` becomes `[[1], 2, 3]`
+Result<std::vector<Value>> flatten(Interpreter &i, std::span<Value>);
+Result<std::vector<Value>> flatten(Interpreter &i, std::vector<Value>);
+
 #endif
diff --git a/src/builtin_functions.cc b/src/builtin_functions.cc
index 82a08e9..4e62e9d 100644
--- a/src/builtin_functions.cc
+++ b/src/builtin_functions.cc
@@ -111,6 +111,7 @@ static Result<Array> into_flat_array(Interpreter &i, std::vector<Value> args)
 	return into_flat_array(i, std::span(args));
 }
 
+
 /// Helper to convert method to it's name
 template<auto> struct Number_Method_Name;
 template<> struct Number_Method_Name<&Number::floor> { static constexpr auto value = "floor"; };
@@ -466,8 +467,8 @@ static Result<Value> builtin_update(Interpreter &i, std::vector<Value> args)
 
 	if (Lazy_And_Number::typecheck_front(args)) {
 		auto [v, index] = Lazy_And_Number::move_from(args);
-		auto array = Try(into_flat_array(i, { Value::from(std::move(v)) }));
-		array.elements[index.as_int()] = std::move(args.back());
+		auto array = Try(flatten(i, { Value::from(std::move(v)) }));
+		array[index.as_int()] = std::move(args.back());
 		return Value::from(std::move(array));
 	}
 
@@ -500,41 +501,41 @@ static Result<Value> builtin_flat(Interpreter &i, std::vector<Value> args)
 static Result<Value> builtin_shuffle(Interpreter &i, std::vector<Value> args)
 {
 	static std::mt19937 rnd{std::random_device{}()};
-	auto array = Try(into_flat_array(i, std::move(args)));
-	std::shuffle(array.elements.begin(), array.elements.end(), rnd);
+	auto array = Try(flatten(i, std::move(args)));
+	std::shuffle(array.begin(), array.end(), rnd);
 	return Value::from(std::move(array));
 }
 
 /// Permute arguments
 static Result<Value> builtin_permute(Interpreter &i, std::vector<Value> args)
 {
-	auto array = Try(into_flat_array(i, std::move(args)));
-	std::next_permutation(array.elements.begin(), array.elements.end());
+	auto array = Try(flatten(i, std::move(args)));
+	std::next_permutation(array.begin(), array.end());
 	return Value::from(std::move(array));
 }
 
 /// Sort arguments
 static Result<Value> builtin_sort(Interpreter &i, std::vector<Value> args)
 {
-	auto array = Try(into_flat_array(i, std::move(args)));
-	std::sort(array.elements.begin(), array.elements.end());
+	auto array = Try(flatten(i, std::move(args)));
+	std::sort(array.begin(), array.end());
 	return Value::from(std::move(array));
 }
 
 /// Reverse arguments
 static Result<Value> builtin_reverse(Interpreter &i, std::vector<Value> args)
 {
-	auto array = Try(into_flat_array(i, std::move(args)));
-	std::reverse(array.elements.begin(), array.elements.end());
+	auto array = Try(flatten(i, std::move(args)));
+	std::reverse(array.begin(), array.end());
 	return Value::from(std::move(array));
 }
 
 /// Get minimum of arguments
 static Result<Value> builtin_min(Interpreter &i, std::vector<Value> args)
 {
-	auto array = Try(into_flat_array(i, std::move(args)));
-	auto min = std::min_element(array.elements.begin(), array.elements.end());
-	if (min == array.elements.end())
+	auto array = Try(flatten(i, std::move(args)));
+	auto min = std::min_element(array.begin(), array.end());
+	if (min == array.end())
 		return Value{};
 	return *min;
 }
@@ -542,9 +543,9 @@ static Result<Value> builtin_min(Interpreter &i, std::vector<Value> args)
 /// Get maximum of arguments
 static Result<Value> builtin_max(Interpreter &i, std::vector<Value> args)
 {
-	auto array = Try(into_flat_array(i, std::move(args)));
-	auto max = std::max_element(array.elements.begin(), array.elements.end());
-	if (max == array.elements.end())
+	auto array = Try(flatten(i, std::move(args)));
+	auto max = std::max_element(array.begin(), array.end());
+	if (max == array.end())
 		return Value{};
 	return *max;
 }
@@ -563,10 +564,10 @@ static Result<Value> builtin_partition(Interpreter &i, std::vector<Value> args)
 
 	auto predicate = std::move(args.front());
 	Try(guard(is_callable, predicate));
-	auto array = Try(into_flat_array(i, std::span(args).subspan(1)));
+	auto array = Try(flatten(i, std::span(args).subspan(1)));
 
 	Array tuple[2] = {};
-	for (auto &value : array.elements) {
+	for (auto &value : array) {
 		tuple[Try(predicate(i, { std::move(value) })).truthy()].elements.push_back(std::move(value));
 	}
 
@@ -589,13 +590,13 @@ static Result<Value> builtin_rotate(Interpreter &i, std::vector<Value> args)
 	}
 
 	auto offset = std::move(args.front()).n.as_int();
-	auto array = Try(into_flat_array(i, std::span(args).subspan(1)));
+	auto array = Try(flatten(i, std::span(args).subspan(1)));
 	if (offset > 0) {
-		offset = offset % array.elements.size();
-		std::rotate(array.elements.begin(), array.elements.begin() + offset, array.elements.end());
+		offset = offset % array.size();
+		std::rotate(array.begin(), array.begin() + offset, array.end());
 	} else if (offset < 0) {
-		offset = -offset % array.elements.size();
-		std::rotate(array.elements.rbegin(), array.elements.rbegin() + offset, array.elements.rend());
+		offset = -offset % array.size();
+		std::rotate(array.rbegin(), array.rbegin() + offset, array.rend());
 	}
 	return Value::from(std::move(array));
 }
diff --git a/src/value.cc b/src/value.cc
index 4229701..a871acb 100644
--- a/src/value.cc
+++ b/src/value.cc
@@ -130,6 +130,14 @@ Value Value::from(Array &&array)
 	return v;
 }
 
+Value Value::from(std::vector<Value> &&array)
+{
+	Value v;
+	v.type = Type::Array;
+	v.array = Array { .elements = std::move(array) };
+	return v;
+}
+
 Value Value::from(Note n)
 {
 	Value v;
@@ -494,3 +502,23 @@ std::ostream& operator<<(std::ostream& os, Chord const& chord)
 	}
 	return os << ']';
 }
+
+Result<std::vector<Value>> flatten(Interpreter &interpreter, std::span<Value> args)
+{
+	std::vector<Value> result;
+	for (auto &x : args) {
+		if (is_indexable(x.type)) {
+			for (usize i = 0; i < x.size(); ++i) {
+				result.push_back(Try(x.index(interpreter, i)));
+			}
+		} else {
+			result.push_back(std::move(x));
+		}
+	}
+	return result;
+}
+
+Result<std::vector<Value>> flatten(Interpreter &i, std::vector<Value> args)
+{
+	return flatten(i, std::span(args));
+}