Samples "Open Your Eyes" by Koko - "Open your eyes, see all the love in me, I got enough forever. Don't be afraid, take all you need from me, and we'll be strong together", and the remix of "How High" by Redman & Method Man - "... and shatter the glass and second half on your funky ass" (Redman is the one who delivers the funky ass sample).

I love this f*cking tune! It is THE best happy hardcore tune ever and i love it.
This tune was made to be danced to and just flows brilliantly.
It starts off with a drum 'n' bass beat with kick-ass vocal over the top. Then the hardcore breaks in and you can't help but mover with it. The real "eye-opener" is when the euphoric melody kicks in and you can't help but feel that this is the best tune ever. The main "open your eyes" vocals are superb about halfway through the song when the "funky ass" bit comes in, you're glad of the breather.
But then it speeds up and when, in my mind, the climax of the song comes in with the second burst of the euphoric "open your eyes" verse comes in, you are in heaven.
I haven't done this song justice with this review and I advise, nay ORDER everyone to listen to this record even if you hate happy hardcore.
If you claim to love happy hardcore and you haven't got this record, you should be sent back to the hell from whence you came.

Eye Opener is one of the all time Happy Hardcore anthems. Sounds much rougher than most of the tunes from that time.