here is an APP called “Sheet Music Bar”, I'll recommend you guys giving it a try.
It has a lot of free sheet music about piano and guitar.
you can find sorts of style like classical,pop,jazz,just searching anything what you want.
Here is app download link: www.77piano.com
I hope it help you to learn more easily.

Hello David,
Thank you very much! It is really interesting. But unfortunately I haven't found there any songs of Lara Fabian... I have a great fondness of this singer since her visit to London... And I think she is quite popular... Could you add there any of her songs, please?

Thank you very much. That app is awesome.