Who or what is known as 'the heartbreakers'?

Based on the clue 'shows youre in this state perhaps you think your...', what is the answer? Which performer is associated with 'tennille'? Who or what is known as 'the dominos'? What does this describe: the e street band? Who or what is known as 'the papas'? What does this describe: the silver bullet band? Who or what is known as 'the tijuana brass'? Based on the clue 'this is an extension of the initials us', what is the answer?