Shawn Mendes' debut album Handwritten will feature hit singles "Life Of The Party" and "Something Big," in addition to new songs crafted by Mendes in writing sessions on his tour bus over the course of the past year, including production by Martin Terefe (Jason Mraz's "I'm Yours" & Train's "Hey Soul Sister"), as well as songs with "Life Of The Party" co-writers Ido Zmishlany & Scott Harris.