Then they bring you into an auditorium where they show a brief history of rock and roll using entirely live performance clips of folks ranging from Muddy Waters to the Beatles to the Clash to U2 and back again.
Then you go into the museum itself, after being handed a pair of headphones attached to an MP3 player with a sensor so that the music you hear matches the exhibit you're standing in front of. They've got clothing, notebooks, guitars (a lot of guitars), records, and stuff. My favorite was the New York City section, which includes an entire shrine to CBGB's: the awning, the sound system, the phone booth, a table and a few chairs, the cash register (complete with a bumper sticker emblazoned across the front that reads: "FUCK YOU, PAY ME"), and other paraphenalia.
Finally, we got to the current special exhibit, which is "John Lennon in New York City." Put together by Yoko Ono, the section celebrates Lennon's time living in the Big Apple, and includes clips, articles of clothing (including his famous "New York City" t-shirt), notes, postcards, and more. (tiggerallyn, you need to see this show if at all possible. Trust me.) For more about the Lennon exhibit check the press release.
Admission isn't cheap, but you get a great show. If rock'n'roll soothes your soul, and you're in the NYC area, check it out.