If you are having a hard time adding your friends' music individually on Spotify, then this application is the best for you to install. Merge Music is an amazing and seamless application to have because you can merge your music from your playlist and your friends'. You can also share your playlist without any hassle. 

Moreover, this application has an additional feature which is the Compatibility Score. With this feature, this application lets you know how you and your friends are compatible in terms of music taste. 

Finally, the best thing about this application is that you can download this for free without any hidden charges at all.