On the music, it prints : Menuet 1re , (re is printed as superscript). I did number sign (dot 3-4-5-6) 1 (dot 1) letter sign (dot 5-6) r (dot 1-2-3-5) e (dot 1-5). I was also suggested that I could replace the letter sign dots 5-6 by dot 4. Which way is better?
If the marking is in a title and therefore is in contracted braille, you should use the letter sign. The only guidance I find in EBAE is "Rule VII. 29. Exception." The second paragraph refers to ordinal numbers with foreign endings, and is, of course, about contracted braille.
If it is in a musical heading or instruction and therefore uncontracted, I don't think you need the letter sign since "r" cannot be misread as a numeral. If it were uncontracted and the first letter after the numeral were one that could be a numeral I'd use the letter sign.