The problem is that I cannot write my own CMS, but I want to create a lyrics site and I don't know which CMS would best suite it and need advices

Mambo can do that.

Try the following site. It lists lots of cms and you can play with demos online of all of them so you can get a feel for how they work and what might suit your needs. Good luck.

Opensourcecms

Most powerfull and flexible free CMS:
http://typo3.com/Screenshots.1238.0.html

It is good, if you have some budget for site creation or you want to make 10+ site in one year (becouse you need at least 2 week to master TYPO3-development)