We call a piece of music with voice a song. What do we call a piece of music without voice? We sing a song but play a XXX.
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The term is "instrumental".
However, it doesn't fit well grammatically in your example sentence, which is understandable. One "sings a song" but one would not say he or she "plays an instrumental", unless it was somehow important that you distinguish the fact that you're excluding voice.
Musicians would more likely not make the distinction that the piece has vocals or not, and say:
In general terms, you can call it instrumental music, but it would be more helpful to describe it in more detail, using terms such as symphony, chamber music, concerto and so on.