His nickname was "Bebop." According to legend, Joe Carroll was the man to call during the height of popularity for that style of jazz, especially if one was trying to locate an elusive genius such as Charlie Parker. To some listeners, however, Carroll is a pariah, not a messiah. He may be one of the earliest singers credited with recording jazz vocalese, a kind of sophisticated term for scat singing, but few fans of this type of performance pick him as a favorite. While the man did cut several albums under his own name beginning in the '50s, the recordings he is mostly known for were done with the extended band of trumpeter Dizzy Gillespie between 1949 and 1953. Novice bebop fans have been known to cower in disgust at the first introduction to one of these sides, which fall pretty far in the musical toss from the sort of serious harmonic adventure that bebop is all about.