I went to a blues/jazz performance there last night and it was quite enjoyable. It's an intimate venue with a bar. In addition to the stage side of the place, there is a separate "library" set up for social interaction. According to Michelle, there will be performance every Friday night at 7 pm, but they will open at 4 pm so people can gather, jam, talk, etc.
Precedence Upstairs is a pretty new venture for downtown Montrose and is still developing. On the 20th they're featuring Big Band music. Check out their website: https://www.precedenceproductions.com for more info and upcoming events.