Science & Technology 
Wedding ring? HORA
Theme: Computer terms reinterpreted
Correspondence between philistines? YAHOOMAIL
Grand Central waitstaff? TERMINALSERVERS
Drum major’s concern through narrow streets? BANDWIDTH
It is refreshing to get away from arts centered puzzles; this one features, in addition to computers, a number of science references (as well as art and opera). 
The Tupolev Tu-144, e.g. SST [Really?]
Back-row bowling target NINETEN [You’ve got as much chance of ever leaving only those two pins than you do of seeing this clue again. I’d go with “___ you big fat hen.”]
Like Magellan, often ASEA [okay, but he’s been dead for a few years; if you must use Magellan, how about cluing it “Like a Magellan” {referring to the GPS}?]
Juillet & ETE
RATING:
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = No fun
