Billy Boola is a live-only track by the Irish rock band U2, emerging from their extensive catalogue of unreleased recordings. The song serves as a poignant tribute to the band's long-time manager, Paul McGuinness, whose nickname inspired the title. Often performed during their later tours, the piece showcases the group's ability to craft intimate, narrative-driven moments within a large-scale concert setting. While not part of a standard studio album, the recording highlights the band's willingness to explore personal themes outside their primary discography. The track stands as a testament to the enduring relationship between the musicians and their management, capturing a specific era of their career through a dedicated, fan-favorite performance that remains a staple of their live repertoire.