For our money, the song of the summer for 2015 has to be "I Know There's Gonna Be (Good Times)" from Jamie xx. The rollicking track, mixing equal parts dancehall, alt-rap and pop, is a far cry from the moody minimalism of The xx, the indie-rock trio that constitutes something of a day job for Jamie. Whereas The xx evokes intimacy and dark, enclosed spaces, Jamie xx's In Colour solo album fairly bursts with a joyful din. It's a paean to club culture, and it's captured the imaginations of enough people that it warranted the opening of a "Good Times" pop-up shop in NYC. One bit of Jamie xx-related merch you won't find there is the "In Colour" tote bag. It's made in collaboration with J.Crew, and it's a free gift with purchase at the following J.Crew locations: Wythe Ave., Brooklyn; On Lan Street, Hong Kong; Regent Street, London; Fifth Ave., New York; Rue Malher, Paris; and Third Street Promenade, Santa Monica. Act fast -- the bag is limited to just 100 pieces per store.