I've been recording a few singer/songwriter types recently. Mostly steel string acoustic guitar and vocals. What do you use for reference recordings for this type of music when trying to listen to monitors and get a fix on the sound of a room? I've found that I don't consider some of my favorites in this genre terribly well recorded. I'm getting set to shop for monitors and I'd like to have references for this type of music. I currently use Joe Pass's lovely Songs for Ellen, but it's nylon string guitar and no vocal.