Richard X is the producer of some pretty masterful pop singles and did that 'mash-up' business when it was still popular to do that.
His 'big break' was this fairly popular song on the hit parade by the Sugababes.
Other Richard X classics include this, this and this.
The best story involving Richard X (and perhaps the best pop story ever) is that when 'Some Girls' was demoed both Rachel Stevens and Geri Halliwell wanted it. When it was given to Rachel Stevens, Geri locked herself in her car and cried.
Briefing