After years of tutelage under a pack of melodious wolves, Bing Crosby discovered that group sing-alongs result in handsome smiles and cardigan collections. Today's Groupon gives you the cocktail courage to croon with your crew: for $25, you get $50 worth of drinks amid the dueling rock 'n' roll pianos at Howl at the Moon on Market Place. Exchange your Groupon at the door for a Howl at the Moon gift card.

Howl at the Moon's talented entertainers tickle the ivories until a bellow of laughter rises from the instrument and wraps you in a familiar tune. They'll make sure your night is an all-inclusive entertainment experience that feeds off your participation and provides a high-energy rock show, incorporating pianos, drums, guitars, and more. Put in a request for that Third Eye Blind song or wait for the show's signature "Showtime" moment, when the whole pack of Moon Howlers will lead you in a choreographed medley of popular tunes, including nostalgic themes and jingles from TV. A fully stocked bar gives patrons the courage to get up and dance while singing along. It's a bit like an Elton John and Billy Joel concert, if Elton and Billy were armed with submachine guns full of rock.

Celebrate the lunar eclipse as the ceiling of Howl at the Moon slides between you and the cratered orbital body with one of its signature drinks. Try the X-Boyfriend, a tipsy blend of X-Rated Fusion and Stoli Vanilla with tropical juices. Howl at the Moon's buckets of boozy concoctions—including the 86-ounce Hurricane Bucket, the Mega Margarita, and the 24-ounce Dr. Feelgood Bone—make a communal cauldron for your coven. Turn your sister's once grating voice into an angelic wind as you sip through a straw from a bucket of hurricane or margarita. Drinks range between $5 and $25.

Throw open your throat and let out a barbaric yawp in a moonwardly direction any Wednesday or Thursday from 7 p.m. to 2 a.m., Friday from 5 p.m. to 2 a.m., or Saturday from 5:30 p.m. to 2 a.m.

You must be 21 to enter.

Reviews

10Best calls Howl at the Moon on Market Place one of the top four attractions in the city. Yelpers are howling for more, giving it four stars. Three out of three Urbanspooners like it, and six Citysearchers give the bar 4.5 stars:

• This Baltimore bar's drink menu is extensive, featuring everything from stable beers to elaborate specialty cocktails and even Howl at the Moon's own house features, like Piano Punch. – 10Best
• This place is great!...There's no way you will leave without a smile on your face! – tvkimber, Citysearch
• I kept on trying to stump the musicians and was amazed what they knew and what they could play! The highlight had to be when even the manager came out from behind the bar and sang every lyric to Flo Rida's Low!!! – James Talvy, Urbanspoon