What do you call a part or a moment in music when several players play it in unison. For instance in rock music when a bass player, guitar player, keyboard player and drummer play a part in unison just before a chorus, bridge or a verse. Or maybe they play some rhythm in unison or a phrase of any kind. Or in symphonic music when the whole orchestra plays a part in unison?
It's just called Unison, no fancy musical terms.
1.. coincidence in pitch of two or more musical tones, voices etc. - Dictionary.com
2.. A combination of notes, voices, or instruments at the same pitch or (especially when singing) in octaves. - Oxford Dictionary
1a.. identity in musical pitch; specifically: the interval of a perfect prime - Merriam-Webster
2.. coincidence in pitch of sounds or notes. - Google Definitions