There are at least two artists with this name: a German girl group and a British rock band.
1.) Wonderwall is a German girl group consisting of eLa (Daniela Förstel) and Kati (Kathrin Schauer) - since autumn 2003 without Jule (Julia Beck). They write and compose all their songs themselves -their music is soft acoustic guitar pop with piano, percussion and English lyrics.
2.) Wonderwall is a British rock band. It’s members are Chuck Martin, Stan Bullock, Marc Diffendal, and Ronald Tucker.
