CNBLUE surprised everyone with the sudden release of a new song on Friday.

"Feel Good" is the new endorsement song for Samsung Galaxy.

CNBLUE leader Yonghwa shows off his writing and composing talents yet again with the new track. He takes the brand's theme "Over the Horizon" and incorporates it into the new tune for a fresh update.

The four-member Korean rock band are just the latest music group to release an endorsement song for use in promotions and product commercials.

Particularly in South Korea where pop music is king, such commercial pursuits usually bode well for the brands and the musicians involved.

"Feel Good" is just another fun, catchy single from CNBLUE, and the endorsement is one that their fans can certainly get behind.

At the moment, CNBLUE is concentrating on their Japanese promotions for their second album in the country (What Turns You On?) and their new single "One More Time."

Listen to the Samsung Galaxy promo song "Feel Good" below.