Getting the key to a song might seem difficult… But really, it is NOT! You can of course use some (expensive) software tool, but there is no need for as you can easily do it yourself.
How to find the Key of a song:
Step 1: Listen to the song
Step 2: Hum along find the tonic note (your mind has some magic mathematical key-finder algorithm).
Step 3: Find the note you are humming on your instrument (if you can’t hum and play at the same time, you can record your own hum and play it back while playing you instrument (play music+hum+record hum, playback hum+match hum on your instrument))
Step 4: From here you can build the scale 🙂
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