it depends whether you are doing a reprint of a beethoven or a score of music composed 
since 1909.

4/4 followed by 12/8 is not found in beethoven's manuscripts.   one does however 
encounter changes from, for example, 8 x 8th notes per measure grouped in twos, to 12 
x 8th notes per measure grouped in threes in a subsequent measure of 4/4.   it was - 
and is - understood that triplets were implied [although they are not always 
indicated]; the quarter in this case remains constant [whether divided in eighths or 
triplets].   some later editions use time signature changes in the place of the change 
in the number of notes per measure and their grouping; quarter @ 60 in 4/4 now becomes 
dotted quarter @ 60 in 12/8, and is invariably interpreted in this manner.

while many other so-called conventions are not really absolutes, but require 
reconsideration in context [forcing the conventions to be rather flexible in some 
cases], i am absolutely convinced that it should be taken for granted to be an 
absolute in music written since 1909 that:

   8th in 4/4 = 8th in 12/8 ...and... quarter in 4/4 = quarter in 2/2, etc...
   *!* unless indications to the contrary appear *!*, either in the form of:
   tempo changes, or graphic indications [q = q.]

there have certainly been exceptions to this rule, but this is one notational reform 
which can clearly be justified and should be encouraged, since tuplets are no longer 
an exception, but a norm in music, and to make use of such archaisms [quarter = dotted 
quarter, without some form of text or graphic indication] is to invite ambiguity and 
fault in the interpretation, one way or the other.

there you have it, my polemic contribution.

jef

-- 

shirling & neueweise \................/ new music notation specialists
mailto:shirling@;newmusicnotation.com :.../ http://newmusicnotation.com

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