Soundcloud Link: https://soundcloud.com/brandonsmb/opus-ii-vs-orbital-halcyon-on-a-fine-day
My Mashup of the following tracks:
Opus III - It's A Fine Day
Orbital - Halcyon And On And On
These are naturally associated with each other as Orbital sampled "It's A Fine Day" for their own track "Halcyon" which later got remade into the track "Halcyon And On And On"
Kirsty Hawkshaw provides the vocals for "It's A Fine Day" and later provided new vocals for "Halcyon And On And On" that are heard in the ending.
"Leave It" by Yes is also sampled in both "Halcyon" and "Halcyon And On And On" towards the end of the song.