We've got a fairly new jam project in the works, and we've decided to add some keys. We currently have 2 guitars, bass, and drums (we're mid-20s to mid-30s). As a frame of reference for what we're going for, our covers will include bands like Phish, Umphrey's McGee, Grateful Dead, Talking Heads, The Beatles, and the like. Here's a video of one of the originals we're working on. It's just a practice video, so it's not super precise, but you'll get the idea.