kayōkyoku; Shōwa-era pop music

(music) variation (a musical technique based on an altered repetition of a theme)

passion (song themed around the Passion of Christ)

(music) etude

(music) cantata

original song (basis of a cover or arrangement)

(fandom slang) VOCALOID song

a bent or biased explanation or theory of something: a distortion, a twisted account of something

to explain or theorize about something in a bent or biased manner: to distort or twist a description of something

requiem (music composed to honor a dead person)