Black Lines is the fifth studio album by American rock band Mayday Parade. Recording was done between March and May 2015 with producer Mike Sapone in New York. "Keep in Mind, Transmorgrification Is a New Technology" was released as a single in July. "Letting Go" was released as a single in October with the album, released through Fearless, following shortly after. The album charted at number 21 in the U.S.