It was performed by the Swedish "dansband" Wizex, back then including Kikki Danielsson as lead vocal singer, together with Lasse Holm.
The song, which lyrical describes about a little singing-screaming girl and her parents who see her screaming abilities as an opportunity to become a singing star in the future, ends with a refrain in English including the words "Decibel, you gonna be a star".
Björn Skifs won that year's Melodifestivalen with the song "Det blir alltid värre framåt natten".
The song was also at Svensktoppen for eleven weeks during the period 16 April - 25 June 1978, peaking at #2.
[1] At Så mycket bättre 2017, the song was recorded by Uno Svenningsson as "Prins Decibel".