D-Side were an Irish boy band established in 2001 by Irish twin doctors Rory and Eoghan Mac Sweeney and signed by Clive Black at Edel Records.
Edel brought in Kim Glover to manage the band after her success with New Kids on the Block, Ant & Dec (as PJ & Duncan), B*Witched and Let Loose.
They had huge success in Japan, the United Kingdom, and Europe, winning 'Best New Band Award' at the Smash Hits Tour in 2002 and scoring 3 UK Top Tens.
The group was made up of 5 members, Derek Ryan (who performed under the alias Ryan O'Riain), Derek Moran, Damien "Dane" Guiden, Shane Creevey and Damien Bowe.
The group then prepared to release their second single, "Speechless" across Europe, building on the successes in their home market.
They released a total of Three albums in Japan, as well as a greatest hits compilation.
The second single was "Speechless", released internationally, gaining some success in Europe and Asia.
The song was also a hit in Europe and Asia, reaching the top 5 in countries such as China, Ireland and France.
"One More Night Alone" missed the top 40 in France and Germany, and in China peaked at No.
The next single was "Sacrifice", a pop-ballad duet with Antony Costa, which was released only in Japan and China.