THEME:   first word of a phrase can precede DIAMOND   
GOOD ONES:     Volcanic Hawaiian landmark {& theme}   DIAMOND HEAD [diamond heads the phrases in a way]   
Singer with Crosby, Stills & Nash   NEIL YOUNG [employing the theme rubric we get another pop singer of the same era]      
BTW:   When was the last time OOF intersected with OOHS, and will it happen again?      
Not sacred   SECULAR [they are not mutually exclusive; e.g., some saints were not religious but secular]      
CUBS, BASEBALL TONIGHT, and SLID [into a base] are tough references for those of us suffering from baseball withdrawal and spring training nowhere in sight.         
RATING: 
 
  
   Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun