Probably 4 - Thunderclap Newman 'Something in the air' (most of rest of old stuff is avoidable, apart from 'Accidents').
Jennifer Rush 'The power of love' (proper original long version - preferably via vinyl) - rest of stuff is rubbish.
Boston 'More than a feeling' (some great stuff on first album, a little on 2nd & a smidgeon on 3rd).
Minnie Riperton did one brilliant song - rest to be avoided.
New stuff (nice rehash of old) = Kaiser Chiefs, especially B & C sides/some early 'Parva' material.
Apart from croaking Bob Dylan, probably Elvis Costello is best performing/writing act currently.