Here is nice FREE backing track by Gianluca Ferro.
Here is a description from Gianluca himself:
I created this backing track by looping the solo section of my song "Accelerating Future". There are 16 bars in the key of C# minor followed by a modal interlude that lasts 8 bars in F Lydian. The modulation from C# Aeolian to F lydian suggest a strong changeover.