Good Vibrations by The Beach Boys is the happiest song of all time, according to a top boffin's formula.
The 1966 hit single ticks all the boxes for the perfect track, says Dr Michael Bonshor, who has a PhD in music psychology.
He worked out which chords, how many beats a minute and which key are needed to create the happiest hit.
Dr Bonshor, of Sheffield University, said: "Studies have found songs are perceived as happy if they are in a major key, with a sweet spot of around 137 beats per minute."
He also found happy songs should have a short intro, repeated riffs, be loud and be both predictable and surprising.
Other top mood-boosting songs, according to the formula, include I Got You (I Feel Good) by James Brown, House Of Fun by Madness and Get The Party Started by P!nk.
Dr Bonshor's happy formula has been used to create a pitch-perfect track called The Lighter Note.
It was commissioned by Mullerlight, who also quizzed people on how music affects their lives.
They found 32% used music every day to improve their mood.
And 46 % of those asked said they felt even happier when they sang along to their favourite tracks.
