Hi there Everyone! First of all I wish You Happy Easter for all!

I am brand new wii owner and I got Guitar Hero on my beloved Wii. I saw on youtube that there are a lots of people who have custom songs. I tried to search on the net if there is a possibility to download custom songs on my wii but I did not find anything. Please someone could explain it to me if it is possible to have custom songs on wii, and so where can I download them from, how could I get some of these?

Thank you in advance for your help!