LAT Mon. 10/19 Mark Bickham

[magus]

 
Sedona and Sorento   KIAS [I was thinking cities]
Peter, Paul, or Mary   SAINT [oldie but goodie]
Man of La Mancha   SENOR [ditto]

Themes that aren't immediately apparent are fun.  I had completed all of the long answers and didn't notice their relationship until I got to KEY.  (Of course, had KEY not been included, I might have hurried passed the theme.)

 
Seems Shakespeare was on Mark's mind:
ANON
ASIDE
OPE
CASCA [from Julius Caesar]
HAG [from Macbeth]

 
Change Tank filler for GAS to Fun, once.
Change Delivery vehicle for VAN to Cliburn or Morrison.