String Music
noun
Remember how 楽 was used in 音楽 (music)? Well this is that 楽 again. So this is string music, which of course means string music.
This is a jukugo word that uses the on'yomi readings of the kanji, and you've learned both. 楽 has two on'yomi readings, but when it's from 音楽, it's read がく.
Because remember: if you play your music too loud, people will come and gawk (がく) at you. And it's the same with loud string music!
学生時代に数年ほど弦楽をやっていました。
I played string music for several years during my school days.