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I have a bottle opener that plays a tune when it's used. How on earth would I change that tune?
It will depend on how the tune has been written to the memory of the bottle opener. It may not be possible at all, or it may only be possible if you have a some serious electrical engineering skills. If you are very lucky there are connections on the board which the factory use and some on-line instructions... but its probably easier to make a whole new circuit to play your chosen song with an arduino or pi-nano - but you are still going to need to need some software and hardware skills for either.
Actually I just had a look - you can buy kits like this: https://forum.allaboutcircuits.com/threads/reprogram-a-greetings-card.159864/ so perhaps some shopping around will find you a suitable ready to use board you can swap out?
Buy a new bottle opener.
Drink beer together. Play tunes together. Start a band.
