THEME:   computer keys (abbreviations) used at the outset of common phrases   
GOOD ONES:     Place to see part of {theme}   PC Keyboard [itself an abbr.]   
Wave catcher?   EAR [audio waves]   
Letters from Greece   ETAs   
Jam ingredients?   AUTOS [traffic jam]   
Nurses at a bar   SIPS [I got the image of a WWII bar with GI's]   
Yodeler's range?   ALPS [mountains, not voice]      
BTW:   That, in Spain   
ESA [but not in the U.S.]      
Shaver   LAD [it occurred to me that shavers probably don't]   
I enjoyed the interesting cluing throughout.      
RATING:    
 
  
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun