"Sting Chameleon Stage - Mega Man X" is a high quality rip of "Sting Chameleon Stage" from Mega Man X.
The melody changes into the tune of Smooth. Later at 0:08, a small part of "Binetsu Kara Mystery" by Lily White (µ's sub-unit) can be heard. At 0:22, the melody changes into the tune of Snow halation.
At 0:33, it's a reprise of the music.