Whether you think Record Store Day is the best thing since grooved vinyl or essentially the indie equivalent of Black Friday, one thing's certain: it's massively successful.

This year's event broke decades-old sales records at independent record stores (even though the biggest seller wasn't even a record at all – it was a a cassette release of Metallica's legendary No Life Til Leather). But there's one other certainty about Record Store Day: it brings out a whole new world of B-sides and rarities that we normally might not ever get to hear. This year's exclusives included a ton of previously hidden gems including one from Father John Misty that makes this installment of Mandatory Music.