Since I Left Your World is the fourth release and first extended play (EP) by the American indie rock band Rookie of the Year, released through 111 Records on November 17, 2009. The EP is a follow-up to 2008's Sweet Attention and contains elements from the album as well as previous albums The Goodnight Moon (2006), and Having To Let Go (2005). The songwriting team of Ryan Dunson and Mike Kamerman fuse acoustic and folk rock with a modern American indie rock sound.