I believe that all the songs on this site may be reposted (either on the "blanket permission list", or with explicit permission). If this is not the case for any of them, or if I have mis-attributed anything, or made any other errors, please let me know . Thanks .
Filk is the folk music of the science fiction community. Here are a few examples I've culled from Usenet filk news group , that demonstrate the range, from parodies to original songs, from hilarious to deadly serious.
For good filk sources, check out
-- Edward Bellamy, Looking Backward, 1887
     
      Glob of Nose Latex
     
     --
     
      Star Trek
     
     alien makeup
     
      
       Alison Brooks
      
      --
      
       Lord of the Rings,
          by Meat Loaf
      
      
       
        Eric the Fruitbat
       
       --
       
        Dilithium
          Rhapsody
       
       --
       
        Star Trek
       
       
        
         Avram Grumer
        
        --
        
         Three quarks for
          muster Mark
        
        --
        
         LotR
        
        
         
          Mark Heiman
         
         and
         
          John Burridge
         
         --
         
          A Funny Thing Happened On The Way To Valdemar
         
         --
         
          on
          
           Mercedes Lackey
          
          novels
         
         
          
           Benjamin Newman
          
          --
          
           My Favorite
          Rings
          
          
           
            Harry Smothers
           
           --
           
            Flying
           
           --
           
            Lord
        of the Rings
           
           
            
             jere7my tho?rpe
            
            --
            
             Lucasfilm Pie
            
            --
            
             
              Star Wars
             
            
            
             
              Kevin Wald
             
             --
             
              Heroine Barbarian
             
             --
             
              G&S
             
             meets
             
              Xena
             
             
              various --
              
               Modern Alien Entity
              
              --
              
               G&S
              
              meets
              
               X-Files
              
    
      
       Rich Brown
      
      --
      
       Hole In The
          Nothing
      
      
       
        William Hughes
       
       --
       
        The Physicist's
          Lament
       
       
        
         Mark A. Mandel
        
        --
        
         The DHMO Song
        
        
         
          Kevin Wald
         
         --
         
          Banned from Aleph
         
         --
        transfinite cardinalities
     
Alas, my friend, thou didst me wrong
To mock me so discourteously
But now thy name is in my song
And it's my turn to mock at thee!