This is a place that most will love and a handful will hate. The music is amazing and different. Unlike anything you've ever heard live. In my opinion Lonie is ECCENTRIC and a genius while other's might think she's a bit nuts. I would rate this spot as one of the most unique, inclusive and one of my all time favorites. A true musical gem that stands out in a world full of plastic, manufactured and cookie cutter / more-of-the-same venues. Keep it Rocking Underground Wonder Bar :)

A very eclectic group of blues,R&B, and jazz musicians so worth walking into, you won't believe how lRe it is when you leave. We met the owner LonI Walker who plays piano and sings with an awesome house band!! She solidifies what the chicago music scene has always been and continues to be. We've scene so many new acts and old acts here that if live music is you're scene you'll be amongst family.

I LOVE LOVE LOVE this place. I have been going there since the late 90s. And it never gets old. It is seriously my favorite bar on earth. The (LIVE) music is always awesome. Especially Lonnie Walkers Big Bad Ass Company Band. There are a few guys on horns...there are 2 percussion sections--and sometimes 3 even. There is a bass guitar-and sometimes a bass cello, a guitar, a grand piano,and tambourines and shakers. AND they JAM! Funky bluesy jammy acid jazzy I dont even know how to describe it. But there is no other place in Chicago that dishes up live music like this. The sound system is fantastic too. And yes, there is usually some dancing going on too! The drinks are decent. And the crowd is fun and eclectic. I have never had a bad time there. Always ALWAYS a blast! OH--and did I mention the snacks?? I finally got around to trying the vegan ruben sandwich last night...it was SOO good-I swear I would not have known it wasnt corned beef if no one told me. Like the best vegan sandwich Ive had...is at a late night bar in Chicago --Who knew?? oh, and we also had the mexican layered dip and that also hit the spot (at 3am)! Warning--spicy. Seriously people--if you have not ever been to the little gem--get over there!! (I recommend after 11pm on a weekend so you can catch Lonnies band--but again--it is ALWAYS a great time. All the music is fantastic there.

The name embodies everything right about the Underground Wonder Bar. I love River North and am in love with the free spirit, unconventional atmosphere and awesome music that lives in this establishment... Definitely worth stopping by when you're around the area, especially after midnight when it REALLY heats up!

This is like an artist playground. Cool laid back atmosphere where musicians,comedians, singers, and poets come and jam it out on open mic. Lots of love from everyone here. Drinks are great too.

The tromboner alone is enough of a reason to come here (pun intended). But for real; the Bad Ass Company Band is phenomenal. The trombone player astounded me. After seeng several shows from Austin, TX to NYC I have never heard a trombone player rock like this guy. Keep it up. Cool place. Cover was a little surprising but as long as it goes to the band it's well worth it.

Great late night live music spot! They get it jumping up in here! Drinks are affordable for the neighborhood. Never know who you might bump into here either. A Chicago local treasure. Open late..

Been here for a couple of times now. The first time I visited here because of live music. I saw reviews in yelp and it said they play really good live music and I am happy I found one good place. First of all they have 10 cover charge and its reasonable compared to other nearby bars and quality of music. Its the place of Lonie Walker and her Big Bad Ass Company Band. They are fabulous, just awesome. One you have heard them you gotta love them. They guy in saxophone and bass guitar are really awesome. Once I heard african tribal music there and it was mind blowing. Rock, Jazz, Blues, Soul you wouldn't miss anything. The only problem is the space is too little to accommodate many people, you might have to stand while enjoying music. You can sketch if you manage to sit, they provide crayons and papers for you to give your imaginations a color. You can join the music too, Lonie sometimes distributes some musical instruments to the crowd if you want to contribute to the live music. So the point is, you won't get bored, I bet. Please visit them if you are in Chicago.