Summer was trained as a gospel singer before her introduction to the music industry and has always been known for her "powerhouse" vocal delivery. Though she is most notable for her disco hits, Summer's repertoire has expanded to include contemporary R&B, rock, pop, and gospel. Summer is one of the most successful recording artists of the 1970s and was the first artist to have three consecutive double albums hit number one on the Billboard charts. She also became the first female artist to have four number-one singles in a thirteen-month period. Summer's website claims that she has sold more than 130 million records worldwide.
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