Finding the right Music

At the moment i am looking on websites like unsigned.com to find music because they provide non-copyright music which we can create a music 'promo' to. If we were to use established artists who copyright there music, we must apply for permission to use their music and to create a video for. This will most likely result in rejection, leaving us with no music to use. They may reject as from the established artists view, it may result in damaging their career or a loss in revenue. Whereas using unsigned artists music, it will provide them with publicity and interest, which may kick start their career.
When chosing i must make sure the lyrics have

NO SWEARING OR OFFENSIVE LANGUAGE TOWARDS OTHERS

NO RAP