I tend to use popular songs in the classroom, as gap-filling listening exercises.
Even though I have an archive of about 100 songs, I always ask my pupils what their favourite songs are and each year I update my song list. I let them know, of course, that if the lyrics cannot be heard clearly and there is inappropriate language, I will reject the song.
Two sites that I use are www.azlyrics.com (with song lyrics) and http://batlyrics.net (with lyrics and video).