1) Cadenza performer 2) Cadenza player 3) Certain performer 4) Concerto performer 5) Concerto standout 6) Featured chorus member 7) Featured musician 8) Featured performer 9) Featured player 10) Guest artist 11) Individual performer 12) Instrumentalist 13) Jazz band improviser 14) Lone performer 15) Lone player 1) Loner 2) Recitalist 3) Singer 4) Vocalist 
(playstyle) See lone wolf (playstyle).
[ballet] In ballet, a soloist is a dancer in a ballet company above the corps de ballet but below principal dancer. ...
• (n.) One who sings or plays a solo.
So'lo·ist noun (Mus.) One who sings or plays a solo. 
[n] - a musician who performs a solo
soloist Anyone who performs a solo.
noun a musician who performs a solo