I love going to concerts, they're great!\
This is usually a  live music performance in front of a crowd of onlookers
Yes, that's correct. I went to a Plain White Tees one recently!
This can be by one musician or a group , it  might even be a musical ensemble  such as an orchestra, choir, or band.
Oh yes, what else do you know about concerts?
Concert
A concert is a live music performance in front of an audience. The performance may be by a single musician, sometimes then called a recital, or by a musical ensemble, such as an orchestra, choir, or band. Concerts are held in a wide variety and size of settings, from private houses and small nightclubs, dedicated concert halls, arenas and parks to large multipurpose buildings, and even sports stadiums. Indoor concerts held in the largest venues are sometimes called "arena concerts" or "amphitheatre concerts
professor or doctor of music. He never gives concerts or makes propaganda for his music; he never conducts an orchestra, or plays an instrument in public (even Berlioz played the tambourine!)
Heseltine depicted Delius as a composer uncompromisingly focused on his own music. "There can be no superficial view of Delius's music: either one feels it in the very depths of one's being, or not at all. This may be a part of the reason why one so seldom hears a really first-rate performance