funky music

so every wednesday morning i spend 45 minutes with all these other girls, they all play saxophone or trumpet, one plays drums, one plays bass. oh and one plays piano. anyway i sit there with my guitar. i play the few notes and chords i know from the music and it all sounds wrong. i get lost in the middle of the piece so i either play what i think sounds right or just not play. theres one song they do and i dont know any of it. but guitar is fun anyway.