Probably because they were offered at the same price as the full-scale models, the 22.5" scale Duo-Sonic IIs and Musicmaster IIs were discontinued ca. 1967. The long-scale Duo-Sonic II was completely discontinued as well. After the old supply of decals was used up, the long-scale Musicmaster II was renamed the Music Master (two words). This name appeared on headstocks from about mid-1968 to late 1976, next to the CBS Fender logo (in black script).

     Aside from the name change, the new Music Masters were virtually identical to the 24" scale Musicmaster IIs. At some point during this era, Music Master bodies were no longer factory-routed for a bridge pickup (since the Duo-Sonic had been discontinued). Perhaps the most noticeable difference was the switch from Kluson Deluxe to Fender-made "F" tuning machines, which had been standard on Mustangs since late '65/early '66. By late '75/early '76, the tuning machine buttons were changed from white plastic to chrome. Standard finishes were again red, white, and blue, with black finishes (and black pickguards) appearing toward the end of this period.

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• All-original Music Master, in red (SN 194500): collage | headstock
  Other specs: neck code is 16 JUL 68 B; body stamped 6810 in the neck pocket; 8-26-68 hand written on the pickup; pots stamped 304-6617 (but '66 pots are common on late-'60s Fenders)
  Source: T. Pershing
  
  

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• Music Master, in red
  Source: Cosmo Gakki (Japan)
  
  

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• Music Master, in white
  Source: Elderly Instruments
  
  
• Music Master, originally in white (but yellowed nicely)
  Note the white pickguard; might be a '74?
  Source: Virginia Beach Guitars
  
  

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• Music Master, white with brown shell pickguard (SN 436406):
  front | body | headstock
  Source: unknown (eBay)
  
  

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• Music Master, in white
  Source: T. Pershing
  
  
• Case study: Music Master, in red with original(?) case:
  front | body, front | body, back | back
  front, in case | front of body, in case | headstock, front | headstock, back
  Source: unknown (eBay) (all images 60-112 k)
  
  

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• The complete(?) spectrum of '75 Music Masters:
  red | cream (yellowed white) | black | green (yellowed blue)
  Source: Gruhn Guitars
  
  
• Case study: Music Master (SN 606377), in blue:
  collage | body, front | body, back | body, in case | headstock, front | headstock
  Source: Music Man
  
  

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• Music Master, in red (with black pickguard; SN 638122):
  front | back | lying in case | body
  Source: unknown (eBay)
  
  
• Music Master, in white (with black pickguard)
  Source: unknown (eBay)
  
  
• Music Master, in all black
  Last of the "II" design series, but with the "76xxxxx" headstock.
  Source: T. Pershing