This is a collaboration with American recording artist Toro Y Moi. The Avalanches' Robbie Chater explained to the Australian Broadcasting Corporation: "Our pal Chaz Bundick [aka Toro y Moi] was getting married at the time that he recorded this song. It's in fact about a night when him and his wife-to-be took LSD on a beach and the experiences they had, it's a beautiful thing."
The song samples the radio opening from Queens of the Stone Age's "You Think I Ain't Worth a Dollar, But I Feel Like a Millionaire."
Mike Campbell from Tom Petty & the Heartbreakers played the slide guitar on "Sixth Avenue Heartache." There is a connection here - Wallflowers lead singer Jakob's dad, Bob Dylan, played with Tom Petty in The Traveling Wilburys.
Meghan Trainor and her producer Kevin Kadish originally wrote "All About That Bass" for another artist to record. However, after Epic Records boss LA Reid heard Meghan play a demo of the song on a ukulele, he signed the young songwriter to his label and told her she should sing it.