You can make YouTube to play songs continuously one after the other like your system’s media player while you work on other sites.
There is an online app available that allows you to do so very easily. So follow few simple steps and see what happens:
Visit this link http://youtube-related-music.appspot.com. Now type album, artist, movie, song etc name and click search.
It displays a list of related songs. Click anyone.
Your song is playing now. It automatically searches for related music playlists and starts playing the songs you like. On the right hand side it displays all related playlists. When the song gets over, the next song automatically starts to play. It also offers a next song button showing you the title of the song coming up next.