Billy Walsh is a songwriter who co-wrote every song on Post Malone's album ‘Hollywood’s Bleeding,’ including record-breaking hits "Sunflower" (17x platinum), "Circles" (second longest-running US Top 10 song ever), and “Wow." Other hits include Post Malone's “I Fall Apart,” "Better Now,” and “One Right Now” featuring The Weeknd,” The Weeknd's "Die For You," "Attention,” and "True Colors,” and Camila Cabello’s “Real Friends.” Recent cuts include the Kid Laroi’s “I Can’t Go Back To The Way It Was (Intro)” and “Without You” as well as Calvin Harris & The Weeknd "Over Now,” Justin Bieber’s "Forever" and multiple songs on Post Malone’s recent album ‘Twelve Carat Toothache.’