old / new / borrowed / blue: 2

old:  Neil Young "On The Beach"
(from 1974's startlingly non-Harvest sounding Harvest follow-up)

new: Willis Earl Beal "Take Me Away"
(2012's aspiring genre-polyglot plays loops with the blues)

borrowed: Destroyer "Leave Me Alone"
(Destroyer's New Order cover sounds more like Destroyer than NO.  A proper cover borrowed from Mikayla C.)

blue: Joni Mitchell "River"
(Nothing sounds quite so Blue