Accompany (verb)

1. To go with or be with someone or something in order to provide protection, support, or companionship.
2. To perform music or sing along with someone else.
3. To be present or occur at the same time as something else.

Origin:

Late middle english (in the sense "go with in order to protect or attend"): from old french accompagner, from a- (from latin ad "to") + compagner "keep company with".

Examples:

1. He accompanied her to the party.
2. She accompanied him on the piano.
3. The singer was accompanied by a guitar player.
4. The pain was accompanied by nausea.
5. The report was accompanied by a set of recommendations.