Singing solely or mainly without instrumental accompaniment.
Related to a form of purely vocal music mostly associated with American college performance groups.
In a manner of a choir with no instrumental accompaniment; literally, "in the style of the (Sistine) Chapel (in Rome)", such as a musical Mass done a cappella.
A vocal performance with no instrumental accompaniment.
Without help from others; unassisted.
Using only one hand.
Designed for only one hand.
In a single-handed manner.