If you don't have the music notation available, how can you determine what key a song is in by just listening? Must one have perfect pitch to do this or is there an easy way or a trick that can help you narrow it down.
The most difficult to figure out - are musical pieces that are played on guitar in alternate tunings which make it difficult to tell what chords are being played. Below is an example of a song that I can't find any visual and very few aural clues to help me.
Perhaps there are multiple ways to identify the key in the absence of a key signature or being able to tell from watching the musician - what chords or scales are being used in the piece. Please share any ideas that work for you. Hopefully one will work for me.