Components
Timber Music Player is an open-source music player that lets you listen to all the songs on your Android. This music player's strong point is without a doubt its lovely Material Design-style interface, which can be customized however you want. But unfortunately it doesn't have the multiple select option.
Proposal
I propose that the above suggestion should be taken into consideration and be added to the app music gallery. It will be a big plus to the app and it will make it more and more interesting to the users. I suggest that the Timber music player developers should add this above mentioned feature to the app, to help the users multi select songs instead of selecting it one by one which is stressful. E.g if they want to share songs to another devices or adding it to their playlist.
Mockups / Examples
Follow the screenshots to see how the feature will look like if implemented.
Click on the menu on the top right hand side..
The options will appear, and you'll find the multiple select option for you to multi select your songs. 
Benefits
If this feature is being implemented and added, it will make it a lot easier for the users to multi-select songs on the music library, instead of selecting it one by one which is a bit stressful. E.g if they want to add songs to their favorite playlist or send it to another user, all they have to do is just multi-select the tracks and add it to their playlist or share it which is way more easier.
Posted on Utopian.io - Rewarding Open Source Contributors
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