GolfScript, 262 bytes

GolfScript, 251 bytes golfed

'Work It
Make It
Do It
Makes Us
Harder
Better
Faster
Stronger
More Than
Hour
Our
Never
Ever
After
Work Is
Over

'2*.n/:a;56,{:@4%.2&+2*:^a=' ':|4^+a='jSRSSS]SSSSSST'81base 3@?/3%[|', 'n]=^)a=+@ 51%48/!*|237118176 2 55@-?/1&@44%32/'Af-'*5^+a=if^9/n*n}/

Try it online!

Eliminated unnecessary [] and simplified code accordingly. Changed i and j to @ and ^ to permit removal of whitespace. Assigned first occurence of ' ' to variable | to avoid repeating the same three characters.

GolfScript, First working version 262 bytes

Commented

'Work It
Make It
Do It
Makes Us
Harder
Better
Faster
Stronger
More Than
Hour
Our
Never
Ever
After
Work Is
Over

'2*                                               #make a string of all the tokens twice and push on the stack
.n/:a;                                            #duplicate the string, split into tokens at newline to form array. Assign to a
56,{:i;                                           #iterate through i= (0..55) 
  [i 4%.2&+2*:j                                   #calculate j=(i%4+(i%4&2))*2 to cycle through 0 2 8 10.
  a=' '                                           #leave a[j] on stack followed by space (token A)
  4j+a=                                           #leave a[j+4] on stack (token B))
  'jSRSSS]SSSSSST'81base 3i?/3%[' '', 'n]=j)a=+   #leave ' ' ', ' or newline on stack as appropriate followed by a[j+1] (token C)
  i 51%48/!*                                      #multiply the data described in the previous line by  !(i%51/48)  (1 or 0)
  ' '                                             #leave a space on the stack
  237118176 2 55i-?/1&                            #leave 237118176/2**55-i & 1 on stack (true or false indicates token D required)
  i 44%32/'Af-'*5j+a=                             #leave i%44/32= 0 or 1 copies of 'Af-' on the stack. Leave a[j+5] on the stack.  
  if                                              #depending on value of last but one line, select an option from the previous line.
  j 9/n*n]                                        #leave a newline on the stack. if 9/n is 1 or more (last line of verse) leave an additional newline
}/                                                #close the loop
                                                  #printing done by implied stack dump on program exit.