When you are transcribing a guitar part you have to think about the key, the chords, and how to play the part efficiently. It's a great way to get a better understanding of the neck since there is usually more than one way to play a part.

This is only partially true. Google has started distributing some APIs automatic updates as well via Google Play Services.

http://developer.android.com/google/play-services/index.html

These features are made available on older releases of Android.