[0'50" to 2'25"]

13:03 Feb 23, 2013 

Thanks for the input. Most of the appropriate sources I have been able to consult use the colon solution. Which I also find aesthetically more pleasing. Since the use of the colon is in extremely widespread use in English (in contrast to use of "apostrophes" in other languages) for track lengths, and since every source I consulted where both global length and identification of specific moments used the same style for both, and since there is no possible ambiguity, I feel comfortable going with the colon. Thanks for the input.

13:50 Feb 21, 2013 

Either is acceptable. Both are used in academic musicological works published by the US. [2:25] is used quite a lot more often, in my experience, than [2'25"], but the latter is also perfectly standard. Another form sometimes used is [2.25]. Use whichever you prefer, and if possible ask your client.

11:46 Feb 21, 2013 

I haven't been particularly successful finding usage, this is the only credible source I've found:
http://books.google.fr/books?id=Pw0JAQAAMAAJ&q="2:25" electr...

11:45 Feb 21, 2013 

The question is about English usage, for publication by a US academic press.

11:41 Feb 21, 2013 

Seeing that there seems to be agreement that both forms are used internationally, can you not go with whatever the source uses?