Changed line 4. Now wonder about line 3... Would 'A stack of logs unsinged / Where crimson candles light the tables' be better?
Where Desperados are drunk
The customers are sober;
Where a stack of logs is untouched by fire
Crimson candles light the tables.
Above hatless waitresses in red and black
Sombreros stay nailed to the walls;
Where loud piped music sounds
Guitars remain unstrummed.
Outside is cold wet November
Inside is moist warm Mexico.
Also, it sounds a bit negative about the place and that's not right. Something else needs to change.