If you think rock ‘n’ roll is just for the boys, then you’re living in the dark ages (seriously), and that’s exactly why Girls Rock Philly is necessary for the music community. GRP is a yearly girls-only week-long summer camp geared towards young, ambitious musicians ages 9 – 17. It teaches campers the ins and outs of musicianship, from writing songs and playing instruments to creating handmade band merch, while building self-esteem, nurturing female empowerment and dispensing important women’s history in a positive environment. And this afternoon, you can witness the progress these excited rock ‘n’ roll campers have made during GRP’s second annual album release all-ages shindig for its Girls Rock Philly 2010 CD compilation and showcase DVD at Johnny Brenda’s (tots under five get in for free!). Celebrating the fruits of its largest camp turnout to date, the GRP show will feature camper and volunteer bands and DJs, as well as great prizes and giveaways of women in rock swag. And if you can’t make it to the show to hear what these rock stars in the making can do, then head over to the GRP website where video of the showcase will be streaming or just swing over to GRP’s CD Baby page to order a copy of the comp after today for yourself. Either way, support these future Chrissie Hyndes as they learn to nurture what they love. Johnny Brenda’s, 1201 Frankford Ave, 12pm, $5, All Ages – Annamarya Scaccia