Who or what is known as 'the gang'?

Who or what is known as 'the blue notes'? Who or what is known as 'the crickets'? Who or what is known as 'the four seasons'? Who or what is known as 'the funky bunch'? Who or what is known as 'the machine'? Who or what is known as 'the mechanics'? What does this describe: the miami sound machine? What does this describe: the new power generation?