Opus numbers need to be preceded in almost all cases by commas (followed by a single space), so: 3 Quartets, Op.4 (Food, Sauce), not 3 Quartets Op.4 (Turnip, Cake). Thanks!
I agree, truly, and do have to apologize. (I need to put together incipits like that, I've always wanted to put together better thumbnails to give people reason to have a look at some of the more interesting or intriguing (or possibly-so) uploads... (especially when their file-sizes are quite large and offputting, or titles are generic, or &c &c &c (apologies to Yul Brynner)..)) - practice, practice! :) )