Do you live in or near a big metropolitan area? If so you can probably fulfill this one within the month depending on how broad your musical tastes are. Some shows are prohibitively expensive, but a lot of smaller ones are remarkably affordable.

Edit: I myself enjoy a decently broad range of music. One of my favorite types of concerts, though, is when the local symphony puts on a movie and they play the soundtrack. These are really fun because you get to go to a symphony concert but if you get bored you can watch a movie!