Never underestimate a great playlist. You may know the right songs in the right order have the power to push you through that last crunch at the gym, but it turns out they can also entice you to load up on an extra side dish or dessert at your favorite restaurant.

Restaurants have long used music to entice diners, but a new Swedish Trade Federation study shows that customized "brand-fit" playlists actually encourage customers to increase their spending. Chains like McDonald's and TGI Fridays are riding the crest of modern-day music streaming services and the plethora of available analytics by incorporating the Spotify-backed service "SoundTrack Your Brand," which generates algorithm-based playlists that are tailor-made for a particular restaurant brand. Aided by these curated playlists, sales of up-sell items like desserts, sides, shakes, and smoothies rose significantly.

Data accumulated by music curation start-up SoundTrack Your Brand and recently shared through digital new outlet Quartz suggests there is as high as a 9.1 percent potential difference in sales revenue seen by restaurants that play curated on-brand background music versus those that simply play a mish-mash of unrelated songs.

Research even suggests that playing no background music at all is a better choice for most restaurants than simply playing a generic list of songs. Food for thought: the next time you tack on a side of fries and a shake to an order from your favorite restaurant, take note of what's playing in the background.

Put the power in your own hands and make playlists that 'Roar'