Ever seen a commercial for something tasty and then went out and bought one? Believe it or not, music can do the exact same thing, but in a much more subtle way. The next time you walk into a store, pay attention to the music thats playing. Generally business music is quite and subtle enough that you barely even notice it, but it does make a large difference. Whether you're aware of it or not, business music has the ability to sooth you, and even alter your mind state and ideally putting you (or your customers) into a buying mood.
The best business music depends highly on what your business is. If your business is high-end car sales or business finances, then you are probably going to want to play classical music or something similar. On the other hand, if your business sells t-shirts to teenagers, then you will probably want to play whatever is popular at the time like r&b music. Playing popular music works in two ways: one, it draws customers in, even if they weren't planning on coming originally, and two, it makes them subconsciously register that your business is a cool and/or good place to be.
The only thing you want to avoid when choosing corporate music is anything rude or explicit. You should know by now that offending people is the last thing you want to do in any business situation. Even if you own a store that caters primarily to teenagers, you don't want to make their parents think that your business is a bad place.