Slide show development

Okay I am about to enter the 20th century ....yeah I know that it is the 21st century already ... but Popsie is always a little behind. I need someone to help me to develop music files on my computer that I can use to add sound bites to a slide show presentation that I am making with Adobe Premiere program. The program is very easy to use and I got the slides inserted but I found out that I don't have any music files on my computer. Where can I find free music files that I can download to my computer. I know that I can use music CD's but I don't have any of those. All I have is a box of tapes that I played in my old red truck. I don't even have a player for them. Any help that you might provide is greatly appreciated! Thanks.