Liquid - Sweet Harmony
Those strings! That piano! A massive hardcore tune from 1992.
Jack Beats picked a classic here.
It's been re-released 3 times since that '92 original, due to its popularity. Danny Byrd even re-recorded a version back in 2010. The vocals & piano riff come from Ce Ce Roger's 1987 recording "Someday".
More information about the track can be found on its Wikipedia page.