Aniplex has a playlist of Bocchi songs played by Mitsui Ritsuo and Adaniya Koki. These guys are very good and all the songs sounded great, but one particular video stood out:
https://www.youtube.com/watch?v=6wAQRxcLUeE&list=PLUH30mfo5wJx7OAZJjZwTFj7p_OuirafW&index=7
This was Mitsui Ritsuo, the guy who did the musical arrangements for Bocchi the Rock, and someone Aoyama-san described as "outrageously super super hyper miraculous guitarist". This reproduction of what happened in episode 12 was definitely one of the more outrageous things. Apparently it took a lot of first strings.
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