This little helper can be used to identify the key a song is in via several methods:
* Analysing live music via the devices's microphone
* Analysing a local audio file on the device
* A set of user-entered chords
All analysis is performed locally on the device, so doesn't use your mobile data allowance.
The results of a scan can then be saved to be referred to later if required.
If there is a song that changes key part way through, on the song detail page you can enter the chords, or analyse via the microphone while you play that part of the song.