expression, ichidan verb
set to music; write music for a song
Used when a composer creates a melody for lyrics or a poem.
彼女が書いた詩に曲をつけた。
I set the poem she wrote to music.
この歌詞に曲をつけてください。
Please write music for these lyrics.
Standard kanji spelling using つける in kana.
Alternate spelling using the kanji 付 for つける.
作曲する means 'to compose music' in general, while 曲をつける specifically means setting existing words to a melody.
Phrase composed of 曲 (song, tune) + を + つける (attach, add). Literally 'to attach a tune'.