B Bemol is B flat, which is very common in music, referring to the key of the piece, as well as the key of some instruments.

The opposite is B Flat Major

Sample Translation:

The structure floats around a slow tempo, B minor arpeggio first with the tonic on B then with the bass line descending to A then G afterwhich it ascends to A then B flat and finally back to B.

Note 1: This is an intriguing document indeed! Please, if anyone knows, tell me where in the Hispanophone world do they use this system instead of a fixed-do solfege system.

Note 2: The use of the English adjective "slow" is odd. Italian is music's international language

Note 3: The use of B flat in this context, namely the key of B minor, is incorrect by the strictest definition. It should be A sharp "La sostenido" (or I suppose in this document "A sostenido").

Question: Dear submitter, please indulge me by confirming or denying my suspicions. Was the original document written by a Spanish-speaking musician who performs popular music and lives in the US?

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Note added at 2 days10 hrs (2008-03-29 03:48:41 GMT)
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Se me hace raro que no se use el sistema do-re-mi-fa-sol-la-si en el original.