Conversation so far:
what can you tell me about Five parts?
Five-piece bands have existed in rock music since the development of the genre.
what does a five piece band entail?
examples of the common vocalist, lead guitar, rhythm guitar, bass, and drums.
what are other examples?
Alternatives include a keyboardist, guitarist, drummer, bassist, and saxophonist.
are there some more examples?
The Sonics, The Dave Clark 5, and Sam the Sham.
what other bands have 5 parts?
Radiohead, The Strokes, The Yardbirds.
how do they differ if at all?
CANNOTANSWER.
what else is interesting about five parts?
).
In some cases, typically in cover bands, one musician plays either rhythm guitar or keyboards.
is the guitar or keyboard appearance dependent on something?
CANNOTANSWER.
are there other instruments that are used?
Other times, the vocalist will bring another musical "voice" to the table, most commonly a harmonica or percussion.
are there examples of vocalists like those?
Mick Jagger.

Question: are there some bands which have musicians singing and playing an instrument at the same time?
Self-contained rewrite: are there some rock musical ensembles, five parts bands which have musicians singing and playing an instrument at the same time?