sentences: "Another sound that McGuinn developed is made by playing a seven string guitar, featuring a doubled G-string (with the second string tuned an octave higher).The C. F. Martin guitar company has even released a special edition called the "HD7 Roger McGuinn Signature Edition", that claims to capture McGuinn's "jingle-jangle" tone which he created with 12 string guitars, while maintaining the ease of playing a 6-string guitar.