What does "m.Iz." or "m.Tz." (or "m.I%." or "m.T%.": I don't know if it is a "%" or a "z") mean in this score? The piece is the waltz "Diana Triste" of the Colombian composer Luis A. Calvo (1882-1945). Here is the link to the score:


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  • Is that actually a "m. I. z."? The stem at the bottom of the "T" seems too big.
    – Dekkadeci
    Aug 29, 2018 at 23:54
  • And what is "m. l. z"? I am a newbie in musical notation.
    – J.C.M.H.
    Aug 29, 2018 at 23:56
  • 4
    Hi, for future posts, please be sure to provide the name of the piece & composer; posting the publisher and a link to the full sheet is helpful as well. Aug 30, 2018 at 11:21

1 Answer 1


My guess is that this is a Spanish score?

If so, the abbreviations tell us which hand plays which notes.

The "m.Iz." stands for "mano izquierda," which is Spanish for "left hand." The "m.d.," meanwhile, stands for "mano derecha," or "right hand."

The upper staff in the second-to-last measure, for instance, will switch hands every beat as you climb up the keyboard: right hand on beat 1, left hand on beat 2, and right hand on beat 3.

Similar terms are used for scores in other languages; see Why is there a "G" marked on an augmented octave in Scarlatti Sonata K466 in F minor?

  • 3
    Yes, it is a Spanish score. Thank you, now it makes sense. The problem is that the "I" looked like a "T", and in the last occurrence, there is a period sign between "I" and "z".
    – J.C.M.H.
    Aug 30, 2018 at 0:25
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    The edition of the score is somewhat neglected. The score appeared in the last page of the Colombian magazine "Mundo al Día" on June 28, 1930. The piece is the waltz "Diana Triste" of Luis A. Calvo.
    – J.C.M.H.
    Aug 30, 2018 at 0:37
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    Just one thing, should be "mano derecha" instead of "mano derecho" since the noun "mano" y feminine :)
    – Daniel
    Aug 30, 2018 at 13:58
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    @Richard -- they both look like "T"s to me, but the reason I mentioned it is that I just rejected a proposed edit to change the "T"s to "I"s in the question. Maybe I shouldn't have rejected the edit, but it seems to me that the misinterpretation of the letters is an important part of the question (though I doubt that this knowledge alone would have helped OP). It seems that others could also make the same mis"T"ake. Maybe the title should be edited to include both spellings....
    – user39614
    Aug 30, 2018 at 14:06
  • 1
    @Richard -- now that the original proposed edit has expired, I have gone ahead and edited the question title and made similar changes to the body (if I would have thought of it before rejecting I would have just accepted and improved the original edit suggestion!)
    – user39614
    Sep 1, 2018 at 2:07

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