Conversation so far:
What can you tell me about a Musical ensemble five-part?
Five-piece bands have existed in rock music since the development of the genre.
What does a five-piece band entail?
The lineup of a five part band entails the common vocalist, lead guitar, rhythm guitar, bass, and drums.
What are examples of a five-piece band?
The Beach Boys, The Rolling Stones, Aerosmith, Def Leppard are five-piece bands in rock music.
Are there more examples of five-piece bands besides The Beach Boys, The Rolling Stones, Aerosmith, and Def Leppard?
AC/DC, Oasis, Pearl Jam, Guns N' Roses, Radiohead are five-piece bands.
What other bands have five parts besides AC/DC, Oasis, Pearl Jam, Guns N' Roses, and Radiohead?
In addition, The Strokes, The Yardbirds, 311 and The Hives  are five-piece bands.
How do five-piece bands differ if at all?
An alternative to the five-member lineup replaces the rhythm guitarist with a keyboard–synthesizer player or with a turntablist such as Deftones, Hed PE, Incubus or Limp Bizkit.
What else is interesting about a five-piece band besides an alternative replacement of a keyboard-synthesizer player?
Alternatives include a keyboardist, guitarist, drummer, bassist, and saxophonist, such as The Sonics, The Dave Clark 5, and Sam the Sham and the Pharaohs.
Is the guitar or keyboard appearance of a five-piece band dependent on something?
In some cases, typically in cover bands, one musician plays either rhythm guitar or keyboards, depending on the song.
Are there other instruments that are used in a five-piece band?
Other times, the vocalist will bring another musical voice to the table, most commonly a harmonica or percussion
Are there examples of vocalist that will bring another musical voice to the table like a harmonica?
Mick Jagger, for example, played harmonica and percussion instruments like maracas and tambourine whilst singing at the same time.

Question: are there some bands which have musicians singing and playing an instrument at the same time?
Self-contained rewrite: Are there some bands which have musicians singing and playing an instrument at the same time?