JGB meaning in Community ?

The J. Geils Band was an American rock band formed in 1967, in Worcester, Massachusetts, under the leadership of guitarist John "J." Geils. The original band members included vocalist Peter Wolf, harmonica and saxophone player Richard "Magic Dick" Salwitz, drummer Stephen Bladd, vocalist/keyboardist Seth Justman, and bassist Danny Klein. Wolf and Justman served as principal songwriters. The band played R&B-influenced blues rock during the 1970s and soon achieved commercial success before moving towards a more mainstream radio-friendly sound in the early 1980s, which brought the band to its commercial peak. They performed a mix of cover songs of classic blues and R&B songs, along with original compositions written by primarily by Wolf and Justman, as well as some group compositions written under the pseudonymous name Juke Joint Jimmy, representing compositions credited to the entire band as a whole. After Wolf left the band in 1983 to pursue a solo career, the band released one more album in 1984 with Justman on lead vocals, before breaking up in 1985. Beginning in 1999, the band had several reunions prior to the death of its namesake, J. Geils, on April 11, 2017.

The band first released several Top 40 singles in the early 1970s, including a cover of the song "Lookin' for a Love" by The Valentinos (which reached No. 39 on the Billboard Hot 100 in 1972), as well as the single "Give It to Me" (No. 30 in 1973). Their biggest hits included "Must of Got Lost" (No. 12 in 1975), "Come Back" (No. 32 in 1980), "Love Stinks" (which reached No. 38 in 1980 and was featured in several films), "Centerfold" (No. 1 in 1982), and "Freeze-Frame" (No. 4 in 1982).