I just bought a PSR 520 on ebay for 72 dollars. I play guitar and harmonica in a blues band. This is my first keyboard. I want to learn. At least be able to play some chord patterns and simple riffs in order to add different sounds to my blues group. I am on a very tight budget. I didn't expect to have the highest bid or the PSR 520. Now that I have it, did I get a good deal? I know that this is a stupid question