Many of us are guilty of busting out a tune while enjoying a shower.

According to Spotify's CEO Daniel Ek, there are 39,000 playlists called "Shower" active on the music streaming service.

After adding up the numbers, Spotify revealed to Business Insider the 20 most popular songs people around the world sing along to during their showers.

The winner of the No. 1 spot might suprise you: it's Wham!'s Wake Me Up Before You Go-Go.

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Other musicians featured on the list include The Weeknd, Imagine Dragons, Iggy Azalea, Shawn Mendes and Meghan Trainor, while classic hit-makers, Neil Diamond, The Supremes, Earth, Wind and Fire and Ace of Base also made the top 20.

We're just surprised the Sesame Street classic bath-time song Rubber Ducky wasn't included.

Have you ever belted out any of these bad boys? Have a listen to the top 20:

20. Maroon 5 - Unkiss Me



19. Bon Iver - Skinny Love



18. Earth, Wind and Fire - September



17. Colbie Caillat - Try



16. Al Green - Let's Stay Together



15. Marvin Gaye, Kim Weston - It Takes Two



14. Four Tops - I Can't Help Myself (Sugar Pie, Honey Bunch)



13. Etta James - At Last



12. The Supremes - Baby Love



11. The Weeknd - Earned It (Fifty Shades of Grey)



10. Shawn Mendes - Stitches



9. Imagine Dragons - It's Time



8. Neil Diamond - Sweet Caroline



7. Shawn Mendes - Something Big



6. Fifth Harmony - BO$$



5. Meghan Trainor - Dear Future Husband



4. Ace of Base - All That She Wants



3. MisterWives - Reflections



2. Iggy Azalea - Work



1. Wham! - Wake Me up Before You Go-Go