Free demo classes are like the gallery openings of childhood, but instead of free wine and cheese and pretentious art talk, you get a taste of some of the best classes available for kids. Here are some classes for babies, toddlers and kids that have free demo classes coming up, plus a super cool try-out opportunity for girls who just want to rock!

T. Kang Tae Kwon Do in Tribeca offers terrific martial arts classes for children as young as 2 years old and up through adult. Visit their open house on Sunday, April 6th at 12pm for a Tae Kwon Do demo by Junior and Adult students and stick around for free trial classes afterward. Register at the open house for a 10% discount. For questions, please call (212) 219-0043 or email tkangtkd@gmail.com.

Apple Seeds, the Chelsea play space is offering a full range of free demo classes like, "almost yoga" for 2.5/3 year olds, crafts, fitness, Spanish, "my Chelsea art opening", cooking and more. Classes are offered for babies up through 5 years old. VIsit the website to see the full offerings and then call to sign up for a free class.

Music for Aardvarks has arrived in a new location in Tribeca and to celebrate they're offering free $15 demo classes throughout the rest of March. You have to reserve a spot online. There are still spaces for March 19, 20, 26 and 27 for these city-centric kid music classes. In addition to the free $15 classes participants will get a free Taxi CD and $50 off Spring registration. [Sorry for the misprint. The classes are not free, but you do get a free CDS]

Not to be outdone, during the first week of April, Music Together is offering free trial classes for new students in several locations around Manhattan including, Murray Hill, Gramercy, Chelsea, SoHo, Tribeca, Battery Park City, and the West Village. Check out their website for dates and locations and to sign up.

In the "not free, but totally worth it" category is the Willie May Rock Camp for Girls MiniCamp this Saturday, March 22nd from 1-7pm at Union Pool in Brooklyn. They'll be giving guitar, bass, drums, keyboard and singing lessons to help uncover the rock star that lurks inside your little princess. Performances by hot girl rock bands Mod Rocket, Magnolia and Care Bears on Fire may inspire an irreversible trend toward uber-coolness. Open to all ages, but recommended for 5 and up. Register online. Performances by hot girl rock bands Mod Rocket, Magnolia and Care Bears on Fire may inspire an irreversible trend toward uber-coolness. Open to all ages, but recommended for 5 and up. Register online.