While Apple Corps soon floundered, it provided the inspiration for corporate philosophies adopted by companies such as Ben & Jerry's, Apple Computer, Inc. and Google. Beatles historian Bruce Spizer identifies the Apple iPod as the realisation of Lennon's idea of combining music, film and electronics. Music journalist Mark Kemp credits the Beatles with leading pop music's expansion into styles such as world music, psychedelia, avant-pop and electronica, and attracting a bohemian audience that had previously focused on jazz and folk. According to Luhrssen and Larson, the Beatles affected every genre of rock music except jazz rock. Together with the Byrds, they are commonly credited with launching the popularity of the "jangly" sound that defined jangle pop. Harrison was one of the first people to own a Rickenbacker 360/12, an electric guitar with twelve strings. His use of this guitar during the recording of "A Hard Day's Night" helped to popularise the model, and the jangly sound became so prominent that "Melody Maker" termed it the Beatles' "secret weapon". Roger McGuinn liked the effect so much that he made it his signature guitar sound with the Byrds. Within a year of their 1964 meeting, the Beatles and Dylan adopted elements of each other's respective genres, rock and folk, into their music. Both acts became a significant influence on the folk rock movement that followed in 1965. In Jackson's view, it was Harrison's twelve-string arpeggios at the end of the Beatles' July 1964 single, "A Hard Day's Night", that "birthed" the folk-rock sound. Dubbed for the Byrds' debut single, a cover of Dylan's "Mr. Tambourine Man", the term "folk rock" referred to "Dylanesque lyrics combined with rock rhythm and Beatlesque harmonies". In response to the Byrds, the Beatles developed the jangle-pop sound of folk rock with the treble-heavy guitars on the "Rubber Soul" tracks "If I Needed Someone" and "Nowhere Man". Gould describes the altered US edition of "Rubber Soul" as the release that encouraged "legions of folk-music enthusiasts" to embrace pop. According to "The Encyclopedia of Country Music", building on the "Beatles for Sale" track "I Don't Want to Spoil the Party", "Rubber Soul" was as an early example of country rock, anticipating the Byrds' 1968 album "Sweetheart of the Rodeo".