This one is a tip to people who like music, but it's not on their PC so they can hear the ones they own. The way then is to appeal to the site Grooveshark.
A script was made available that aims to improve your experience with the site, taking away ads (which only happens to the VIP account) and still adds lyrics from the songs (the only problem is that there are only 3 sites available to search the lyrics).
You can take the script Here.. To find out how to install it in your favorite browser, visit this page.
I just tested it with Chrome and Opera and it worked fine.
Source [LifeHacker]