What is the collective noun for solo?

There isn't a specific collective noun for "solo." The word "solo" itself implies a single individual performing alone, so a collective noun wouldn't make sense in this context.

However, you could use other terms depending on the context:

* Ensemble: If you are referring to a group of soloists performing together.

* Recital: A group of solo performances.

* Concert: If the soloists are part of a larger musical event.

* Lineup: A list of solo performers.

Ultimately, the best term to use will depend on the specific situation you are describing.