So, fretted instruments started really becoming popular and widespread in the later middle ages with the lute, theorbo, vihuela, and early guitar. The thing is, it’s not like there was any kind of “lute standardization league” while people were dying of the plague, so people just tuned to whatever tuning worked best for them. In fact, lutes and theorbos that had a bunch of strings (7-12+ pairs of strings) would often have to retune the lowest pitched stings to match with whatever key the song was in.
So you let that run for centuries, even milenia, and you get a whole bunch of tuning systems, each with thier own strengths, weakenesses, and tradition behind them. This eventually collapsed into the “standard” instrument tunings we have today
Source: am a classical guitarist and wrote a college paper on the history of guitar like, 4 yrs ago
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