I made a comparative mashup of both modern and classic versions of Reimu Hakurei's battle theme, Mystic Oriental Love Consultation [東方妖恋談]:
http://www.youtube.com/watch?v=p_pD3qKXy9I&fmt=22I had to speed-up the classic TH03 version 1.025x in order to match the tempo in the modern TH10.5 version, plus I had to cut out portions of the modern TH10.5 version (thus ending up with an abridged recut) in order to get a proper stanza match.
If you mute your right speaker, you'll listen to the [abridged] modern version featured in Scarlet Weather Rhapsody. If you mute your left speaker, you'll listen to the [sped-up] classic version featured in Phantasmagoria of Dim.Dream.
To listen to the full, unabridged TH10.5 version alone:
http://www.youtube.com/watch?v=PhHBg---Fa0&fmt=22To listen to the full, non-spedup TH03 version alone:
http://www.youtube.com/watch?v=m7RHpx963VI&fmt=22