The first thing that you should do is download Free Music Zilla, then install it. Free Music Zilla automatically monitors Internet Explorer and Firefox Browsers by default.
Open Free Music Zilla then choose from these websites to download free mp3/music/song from imeem ,last.fm ,pandora ,myspace and almost all social music services.
Choose from any playlist that you want to play and download. On the Free Music Zillz, click on the check box while playing your chosen music, then click Download. It will automatically be downloaded on C:\downloads folder by default.
After downloading, rename the flv file to a more descriptive file name then convert the flv file to any music format you want thru Media Covert.