JJ meaning in Community ?

Joan Jett (born Joan Marie Larkin, September 22, 1958) is an American rock singer, songwriter, composer, musician, record producer, and actress. Jett is best known for her work as the frontwoman of her band Joan Jett & the Blackhearts, and for earlier founding and performing with the Runaways, which recorded and released the hit song "Cherry Bomb". With The Blackhearts, Jett is known for her rendition of the song "I Love Rock 'n Roll" which was number-one on the Billboard Hot 100 for seven weeks in 1982. Jett's other notable songs include "Bad Reputation", "Crimson and Clover", "Do You Wanna Touch Me (Oh Yeah)", "Light of Day", "I Hate Myself for Loving You" and "Dirty Deeds".

Jett has a mezzo-soprano vocal range. She has three albums that have been certified platinum or gold. She has been described as the Queen of Rock 'n' Roll. In 2015, Joan Jett & the Blackhearts were inducted into the Rock and Roll Hall of Fame.

Jett lives in Long Beach, New York, and has been a New York resident since the late 1970s.