Figuring out the key to a song by ear

My technique of finding out the key by ear is based on something I saw on youtube. Essentially you loop the song you want to find the key of, then on the piano, play all of the notes one by one and decide if the note sounds sounds wrong in relation to the existing notes in the song (most likely because it’s not a note of the same key) or if it sounds okay.

Once you have identified enough notes that sound wrong in the song, you can start using that to figure out what notes should be sharpened or flattened to end up with the key of the piece.

I’ve only tried this once or twice but it did work for me.

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