Of course you do. She’s Joan Jett, and people who mitch and boan about the talent lineup at the Beale Street Music Festival must not be fans. I rolled up to the Sam’s Town Stage not long past 7:30 for what is sure to be a personal fest highlight: Jett — looking exactly like “Joan Jett,” in tight leather pants and a close-cropped helmet of Jett-black hair, as opposed to the new millennium post-apocalypse shaven pate she sported at Memphis in May in 2000 — and her Blackhearts were already blasting out “Cherry Bomb,” the bratty jailbait classic from Jett’s old band, The Runaways. They followed with “Light of Day” (the Springsteen composition Jett performed in the 1987 film of the same name); then “Do You Want to Touch Me (Oh Yeah)”; then “Bad Reputation”; then The Replacements’ “Androgynous.” Hey hey, my my.