A vocal performance with no instrumental accompaniment.
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 form of monophonic chant in unison using the Gregorian scale, sung in various Christian churches.
A plain unvarnished statement, without exaggeration.
A cantus firmus or theme chosen for contrapuntal treatment; so called because often an actual fragment of plain-song.
The simple notes of an air, without ornament or variation.