There are multiple artists with this name:

1) Special D. (real name Dennis Horstmann) is a German DJ and dance music artist who is particularly popular in The Netherlands, where he won the "Best Dance International" award at the 2004 TMF NL Awards. He is also popular among the Euro-Trance scene in North America.

His best known track, "Come With Me", reached number No6 in the UK Singles Chart and No4 in the Irish Singles Chart in April 2004.

2) Special D is an American Christian alternative rock band from western Kentucky.