For this song (and all morphine songs) you need to tune your A string down so that the
fret on A matches your G string, sort of like drop d, only moved up a string.
[ Tab from: https://www.guitartabs.cc/tabs/m/morphine/buena_btab_ver_3.html ]
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--5-5--8--55-85--5-55--8--5-----5p0h4p0-------|
--5-5--8--55-85--5-55--8--5----0-------8-5----|
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--3-3--3/7--7--5-55-8-8-10----------------|
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you see i met the devil nameda buena buena....
