The tapes contains music that might be familiar to you. Have you heard any background music while traveling in minecraft that you would like to listen to. There might be a tape for that!
For now there is only 1 tape bundle (Tape Bundle [Overworld]).
To play music Right Click/Tap on the Boom Box while holding a tape
You will know the Boom Box is working when it produces note particles. While the Boom Box is playing music you will not be able to destroy it. To retrieve the tape simply Right Click/Tap on the Boom Box the tape will pop out and the music will stop.
In the future updates I will add more music.