A solo is a passage or entire piece performed by a single musician, with or without accompaniment. The soloist carries the main melodic interest while any accompanying forces support rather than compete.

Concertos feature a solo instrument or voice against an orchestra. Jazz performances often alternate ensemble sections with improvised solos. In popular music a guitar solo or vocal bridge can serve as a highlight. Solo repertoire also includes unaccompanied works that place the entire musical responsibility on one player.

Performing a solo demands technical security, expressive commitment, and the ability to project musical personality. The contrast between solo and ensemble textures is one of the basic dramatic resources of music. Listeners often remember the solo moments most vividly.

Even within a large group, a well-placed solo can focus attention and heighten emotion.