The last two years have seen a teenage riot of bands taking rock `n' roll by storm. (You're not getting older-the rockers are just getting younger.) The new spin? A lot of these youth-quakers are female. Sick of boys having all the fun, and built-by-Disney stars representing their lives, girls are plugging into the music world. Look for sales of Daisy Rock guitars to skyrocket after this summer's double bill of inspirational how-to-start-a-band books, each fronted by rock-goddess role models. On Stage One: Sleater-Kinney's Carrie Brownstein opens for Rock `N' Roll Camp for Girls (Chronicle). Stage Two: Robyn "Sprout" Goodmark's Girls Rock (Billboard), with Kim Gordon of Sonic Youth on foreword. From writing songs to recording a CD, to fending off creeps, these books nurture confidence as well as creativity, empowering girls to not only fight the cock-rock mentality but kick out the jams.