Lady Gaga, an iconic singer known for her theatrical presence, and Bruno Mars, a Grammy-winning artist celebrated for his catchy tunes, dive into the resurgence of sentimental duets. They discuss their unexpected hit "Die With A Smile" and its ties to the film "Joker: Folie à Deux," exploring emotional depth and vocal chemistry. The duo reflects on classic collaborations like those of Sonny & Cher and the importance of major seventh chords. There's excitement about the nostalgic revival of duets in modern pop, hinting at a rich musical future.