Music Bar is part of the new development Yoyogi Village (read more about it here. It's not purely a jazz bar though the night I dropped by they were playing Nina Simone and Jimmy Smith records on the phenomenal sound system.
It's a bit of a fancy place with elegant decor, well-dressed staff (who raced over to stop me from taking any pictures or videos..ahem...) and expensive prices, more of an Azabu or Omotesando type joint than the dingy jazz bars this site usually profiles. The sound is truly incredible though and there's an extensive vinyl collection against the wall at the end of the bar. As a spot for a late night drink or two it's certainly atmospheric. Good date spot for music geeks.
Station: Yoyogi Station - JR, Oedo Subway Line
Exit: JR West Exit, Oedo Line Exit A1
Distance from station: 2 minutes