Romero signed to Once Records and released the tracks "Privilege" and "Qwerty".
It was followed by the track "Funktion One" was released, which was mixed by Azucar (from Madskillz and Gregor Salto) and later added "Hear My Sound".
In 2009 he remixed  Tony Cha Cha's track "Get on the Floor" and a bootleg for David Guetta entitled "When Love Takes Over".
Both tracks increased his profile and the Ministry of Sound contacted him to do some remixes on their label.
He also made a remix for the Dirty South track "Alamo".

In 2010 Nicky Romero came up with a new track called "My Friend" (released on Spinnin' Records) which features a sample from the well known Groove Armada track of the same name.

"My Friend" has been played by DJs and record producers such as Tiësto, Axwell, Fedde Le Grand, Sander van Doorn and many more.
The track reached Number 4 at Beatport worldwide overall chart, Number 1 at Dance-Tunes chart and several other famous DJ charts.
2011 saw Romero release plenty of remixes such as "Where Them Girls At" by David Guetta featuring Flo Rida and Nicki Minaj, "What A Feeling" by Alex Gaudino featuring Kelly Rowland, "Stronger" by Erick Morillo and Eddie Thoneick featuring Shawnee Taylor, "Where Is The Love" by Eddie Thoneick and "Rockin' High" by Ben Liebrand.
Romero signed to Once Records and released the tracks "Privilege" and "Qwerty". It was followed by the track "Funktion One" was released, which was mixed by Azucar (from Madskillz and Gregor Salto) and later added "Hear My Sound". In 2009 he remixed  Tony Cha Cha's track "Get on the Floor" and a bootleg for David Guetta entitled "When Love Takes Over". Both tracks increased his profile and the Ministry of Sound contacted him to do some remixes on their label. He also made a remix for the Dirty South track "Alamo".
In 2010 Nicky Romero came up with a new track called "My Friend" (released on Spinnin' Records) which features a sample from the well known Groove Armada track of the same name.
"My Friend" has been played by DJs and record producers such as Tiësto, Axwell, Fedde Le Grand, Sander van Doorn and many more. The track reached Number 4 at Beatport worldwide overall chart, Number 1 at Dance-Tunes chart and several other famous DJ charts. 2011 saw Romero release plenty of remixes such as "Where Them Girls At" by David Guetta featuring Flo Rida and Nicki Minaj, "What A Feeling" by Alex Gaudino featuring Kelly Rowland, "Stronger" by Erick Morillo and Eddie Thoneick featuring Shawnee Taylor, "Where Is The Love" by Eddie Thoneick and "Rockin' High" by Ben Liebrand.
Nicky Romero