The TV spot, due to break next week, will see "The Clever Hamsters" band demonstrating its musical virtuosity.
Auditions to joint the band were held following classified ads placed in The Stage, The Sun and The Metro asking for talented hamsters to take part.
The tune from the ad will be released as a single in time for Christmas.
It will be the follow-up to the 'pheasant rodeo' spot for Drench, which received a lukewarm reaction.
United Kingdom
CHI creates hamster jazz band for Drench ad
LONDON - Following an X Factor-style audition, CHI has assembled a jazz band - consisting entirely of hamsters - to star in its latest ad for Drench water.