Yeah it's a cracking venue is The Cavern. They have bands on all times of day right through to about 1AM, although the ones during the day tend to be cover artists doing Beatles covers. It's well worth a visit. There is some memorabilia there but not a great deal and certainly not an RS guitar (must have been thinking Manchester's Hard Rock Cafe. There's an RS guitar in there). Across the road though is The Cavern Pub and that has quite a bit of memorabilia, such as a Brian Adams guitar, a Beatles drum kit and gold records from various artists.