"29" is a song by Belgian singer Loïc Nottet, released for digital download on 5 June 2019 by Sony Music as the third single from his second studio album Sillygomania. It was written by Sacha Skarbek and Nottet, while the production was handled by the latter. A piano-driven ballad, the track builds to a "strong and explosive" chorus and features Nottet reaching high notes throughout. The autobiographical lyrics delve on the ending on a relationship and also approach themes of hopelessness, loneliness and struggle.