Galaxy tab 10.1 music help!?

i jus got the galaxy tab like 2 days ago and im experiencing a problem everything else is great i like it alot but i plugged my tab into the computer and drag music into the "music" folder on the tab but not all the music shows up in the music app but if i go to my storage its all there... anyway i could fix this? so allll my music is in the music app place???