With D language it can be the music, instruments, player and the conductor all at once [1].

Fun facts, Walter the original author of D language wrote his popular Empire game in Fortran [2]. Some of the ideas that make Fortran fast is incorporated into D language design and this makes D is as easy if not easier to optimize than Fortran [1].

[1]Numeric age for D: Mir GLAS is faster than OpenBLAS and Eigen:

http://blog.mir.dlang.io/glas/benchmark/openblas/2016/09/23/...

[2]A Talk With Computer Gaming Pioneer Walter Bright About Empire:

https://madned.substack.com/p/a-talk-with-computer-gaming-pi...