A musical composition for one voice or instrument (with or without accompaniment) WordNet 3.0 & Open English WordNet

In music, a solo is a piece or a section of a piece played or sung featuring a single performer, who may be performing completely alone or supported by an accompanying instrument such as a piano or organ, a continuo group, or the rest of a choir, orchestra, band, or other ensemble. Wikipedia

A piece or section played or sung by a single performer Wikipedia Disambiguation

A person playing music or singing alone Wikipedia Disambiguation

Musical piece or part of musical piece performed by a single musician; musical performance by a single voice, musician or instrument Wikidata