Can you tell me the name of the font used to write the songs on the back cover please ?

ITC Avant Garde  Suggested by pantextual 

too small

Excuse me I posted the wrong link.
But I didn't found it bigger than that : http://sphotos-a.xx.fbcdn.net/hphotos-prn1/c0.0.843.403/p843x403/65137_10151266897814304_1795567341_n.jpg

Looks like a modded version of Avant Garde.

http://www.dafont.com/forum/read/75353/ke-ha-s-back-cover

Could be a modded AG, but...