In the 1990s, when computers used large floppy drives, I enjoyed playing games like Pacman and Paratropper in DOS environments. Later on, I became fond of Prince of Persia. I played the game even on Windows 98, by then it had become lot more colourful and rich in visuals. One of the main features of the games were their music.
If you want to play those retro games online or listen to some 8-bit music, head to Woolyss.com. You can play games like Super Mario and Prince of Persia in your Web browser. Apart from this, you can also listen to 8-bit or chipmusic on the website.
For those interested in experiencing the DOS games in the original environment, there are www.dosgames.com, www.dosgamesarchive.com and many more websites.