Here is a small blurb mentioning Rudolf Schenker in a guest role:

Avantasia – THE SCARECROW
RELEASE DATE:
February 5, 2008

Track List:
01. Twisted Mind
02. The Scarecrow
03. Shelter From The Rain
04. Carry Me Over
05. What Kind Of Love
06. Another Angel Down
07. The Toy Master
08. Devil In The Belfry
09. Cry Just A Little
10. I Don’t Believe In Your Love
11. Lost In Space

“Lost In Space” Video
“Carry Me Over” Video

THE SCARECROW will feature guest appearances by the following artists:

Alice Cooper (vocals)
Amanda Somerville (vocals)
Bob Catley (Magnum; vocals)
Jorn Lande (ex-Masterplan; vocals)
Kai Hansen (Gamma Ray; guitar)
Michael Kiske (ex-Helloween; vocals)
Oliver Hartmann
Roy Khan (Kamelot; vocals)
Rudolf Schenker (Scorpions; guitar)

For more information see:
http://www.tobiassammet.com/
http://www.myspace.com/tobiassammet