Bee Gees

The Bee Gees rank as the most commercially successful act on this list, with over 220 million records sold worldwide—outpacing #6 Silverchair by more than 200 million units. While their disco era defines much of their legacy, the Gibb brothers began as a rock act in 1958 on the Isle of Man before relocating to Queensland, Australia. Their songwriting genius produced timeless classics across genres for four decades, including rock anthems like "Spicks and Specks." Notably, they are the only family group in history to have five consecutive number-one singles on the Billboard Hot 100, a feat unmatched by any other band here. Their ability to dominate rock and pop charts simultaneously is faster than the average multi-genre act, cementing their status as Australian music royalty.