Ford and Paul were music superstars during the first half of the 1950s, putting out 28 hits for Capitol Records between 1950 and 1957, including "Tiger Rag", "Vaya con Dios" (11 weeks at #1), "Mockin' Bird Hill" (top 10), "How High the Moon" (nine weeks at #1), "Bye Bye Blues" and "The World Is Waiting for the Sunrise". These songs featured Ford harmonizing with herself, giving the vocals a novel sound. Paul and Ford did all their recording at home or on the road and submitted the masters to Capitol, with Paul dictating to the record company what songs were destined to become hits. Paul and Ford also used the now-ubiquitous recording technique known as close miking, where the microphone is less than six inches from the singer's mouth. This produces a more intimate, less reverberant sound than when the singer is a foot or more from the microphone (see proximity effect). It also emphasizes low-frequency sounds in the voice. The result was a singing style that diverged strongly from earlier styles, such as vocals in musical comedies of the 1930s and 1940s.