Adams was a member of four-piece boyband A1, who won a BRIT Award in 2001 for Best Newcomer and had two number one singles, "Take On Me" (the chart-topping song that was originally made famous by and written by the Norwegian band "a-ha") and "Same Old Brand New You", before separating. Whilst in the boyband, Adams also scooped a Smash Hits Poll Winners Party Award for Most Fanciable Male in 2001.
After a couple of years writing, Adams made a comeback with a new solo recording contract. His first solo single, "Sorry", reached No. 18 on the UK Singles Chart in June 2005. As well as writing for himself, Adams began writing and producing for other artists. He co-wrote the Lisa Scott-Lee single "Electric" with Guy Chambers, as well as a song called "Get Off My Girl" with Har Mar Superstar.
Adams has his own recording studio situated in Battersea Park called Parkbench Studios. He is currently the creative director behind the bands Kissing Freddie, and What Jane Did Next (which Adams is a part of). When he entered the Celebrity Big Brother house in 2009, it was revealed that Adams had worked on songs for X Factor winner, Alexandra Burke.