Manuscripts/Mixed Material Letter from Aaron Copland to Carlos Chávez, July 1937.
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Finos de junio
[late June] Sat. 
Dear Carlos -----
I'll be in Mexico sometime between the 4th and 7th. Please don't be surprised if I rush right to Tlaxcala. (Victor writes that the house is free!) You see, I am terribly late with my radio commission piece, and must work on it every minute if I am to get it done in time (by July 15)[.] But in any case, of course I will call you up. I have the parts of the Salon Mexico with me and will bring them along, instead of mailing them. I can drop them by at the office in Mexico.
I imagine you are collossaly busy! I saw Mrs Coolidge here, and she is naturally disappointed not to be able to come.
Lots of luck with the Festival. If I can be of help in any way -- let me know.
P.S. I saw the programs. They look very good, tho a little long. How did you manage to 'invent' so many South American composers? I marvel at it!