I would like to have a time table- daily or weekly of the performance
of the Monastery children chorus in Monteserrat Spain.

Hello

The chorus is officially called "Escolania de Montserrat."

A schedule the Abadiamontserrat.net web site indicates that the
Escolania performs at particular times ( 13.00h & 18.45h on weekdays;
08.00h, 13.00h & 18.45h on Saturdays; and 12.00h on Sundays):
http://www.abadiamontserrat.net/html/eng/serviciosrel.htm

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search strategy:
montserrat chorus
Escolania montserrat vespers

I hope this is the information that you were seeking.  If not, please
let me know via the "request clarification" feature. Thanks.