D-Side were an Irish boy band established in 2001 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. A highlight for D-Side was getting a recording contract with in Japan with Avex and they worked with them until the end of 2007. 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'Rian),Derek Moran, Damien "Dane" Guiden, Shane Crevey and Damien Bowe. The band released their first single "Stronger Together" in Ireland only, which reached No. 5 on the Irish charts. The group then prepared to release their second single, "Speechless" across Europe, building on the successes in their home market. "Speechless" was released thereafter achieving three top 10 singles in the UK/Ireland and some around Europe. They supported Blue, Westlife and many other groups on tour during 2001 and 2002, before headlining their own live shows, as well as being involved in many charity events such as Soccer Magic, Soccer 6, Children in Need and ChildLine. In 2006, D-Side took part in the international contest "New Wave" in Urmala. They released a total of Three albums in Japan, as well as a greatest hits compilation. They were signed to the Japanese record label Avex and were managed by John Black at Black Gold Music Management. After their split in 2007, Moran went on to present Milkshake! The Number 1 Kids Tv Show in the UK on Channel 5.