A cappella is an Italian phrase which means 'in the style of the chapel. ' It was originally used to refer to music that was sung in a chapel or small worship space without accompanying instruments, as opposed to a large church where vocal music was usually accompanied by an organ.
Fuck the beat, I go acapella
Fuck a papa doc, fuck a clock, fuck a trailer, fuck everybody
Fuck y'all if you doubt me
I'm a piece of fuckingwhite trash, I say it proudly! - Eminem – 8 Mile: B-Rabbit vs Papa Doc.
An acapella is a genre of music consisting of either a singular person or a group (eg. pentatonix) who sings a certain song without music, sometimes creating their own music with talents like beatboxing.
Pentatonix: We just released a new acapella!
World: nobody fucking gives a damn, we're too busy remembering xxxtentacion (r.i.p brother)
Song or piece of music originally played and/or recorded using instruments whose sound can be easily translated by a moderately competent arranger/composer to be used in recording and/or live performances using ONLY human voices
Artists such as Sarah McLachlan and Sting who stress album production over singular attention to an instrument or voice are very acapellable for many college and professional groups.