A website that has audible sample tracks?

Ok, finally, I'm very happy with my system. I want to ebay many CDs as i can but, at the same time, i wanna quickly go thru (listen)them first before engaging.
May I ask what website has the most audiable samples for all CDs?
iTunes allows you to preview songs, but only portions of the song. Are you looking to hear entire tracks?
spotify.com and mog.com if you want full tracks. amazon.com, itunes.com and emusic.com for partial tracks. I'm sure there are lots of others.
@jlind, no. I just need to hear partially samples of what EXACTLY in the CDs that I am interested in.
@Sfar, thanks. I'll look them up