Just like everything else, you want to have a backup place in case one place does not work out. It can be very tempting to think that all you need to do is send your beats to one spot and things will just magically work out for you. You need to send your beats out to a variety of different places in order to maximize your results.
Having a hard working mentality and one where you never give up, you are going to get the placements that you have been looking for. Even if they do not take your beats, you may end up making contacts that are going to be extremely beneficial to you in the long run. You should also ask for constructive feedback if they do not choose your beats.