Like many "Glee" numbers: Var

• Like many doo-wop groups: Var
• Like many doo-wop sessions (var.)
• Without any musical accompaniment (var.)
• Like many doo-wop groups: Var.
• Without backing, in a way: Var

Wikipedia Word definitions in Wikipedia
" Acapella " is a song by American music duo Karmin . It was released on July 9, 2013 by Epic Records as the lead single from their debut studio album, Pulses (2014). The single was written by group members Amy Heidemann and Nick Noonan, as well as Sam ...

Wiktionary Word definitions in Wiktionary
adv. (alternative spelling of a cappella English)