Know which soundtrack will make your video sing.

Twix, ‘Conveyor Belt’

Mars Inc. wanted to know how the choice of soundtrack to an ad might affect its impact on the audience – so we ran a small study with an old Twix ad to find out.

We tested the same 30-second Twix ‘Conveyor Belt’ ad, but with two alternative soundtracks. The soundtrack choice was particularly important here, as there was a deliberate pause in the middle of the ad to dramatise the moment when the protagonist bites into the second Twix bar. This notable instance made it an especially good ad to test.

The Brief

We sought to investigate the importance of music in video advertising by testing the same ad, but with two different popular tracks, Mars wanted to know whether the different tracks affected the emotional response of the viewers, and which track had the greater impact.

Our Approach

It took less than 36 hours to test both videos on two sets of 300 people, with the emotional results instantly visible online as they came in. 

Emotional Analysis

Track 1 displayed higher happiness levels throughout the ad, demonstrating that it was better aligned with the underlying story than Track 2. Even though the video asset was exactly the same, Track 2 showed significantly reduced average happiness levels.


Track 1 garnered an EmotionAll® score of 5 (better than 36% of ads), much stronger than the 3 (better than 13% of ads) awarded to Track 2, indicating the former will be stronger in driving brand lift metrics.

Picking the right soundtrack improved the ad performance x3

Actionable Insight

Mars were immediately able to discern which ad was more successful. When comparing happiness levels between the two versions, Track 1 was unequivocally the more popular and effective version.  Using the track would be more likely to drive brand favourability and purchase intent.


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