The following selections were found in iTunes for
Memphis Minnie "Night Watchman Blues":

Title	Artist	Album	PURCHASE
Night Watchman Blues (Take 2)	Memphis Minnie	Early Rhythm and Blues 1949
Night Watchman Blues (Take 1)	Memphis Minnie	Early Rhythm and Blues 1949
Night Watchman Blues	Memphis Minnie	Queen of the Delta Blues, Volume 2 (E)
Night Watchman Blues	Memphis Minnie	Blues Legends, Vol. 5
Night Watchman Blues	Memphis Minnie & Sunnyland Slim	Blues Forever: In My Girlish Days
Night Watchman Blues	Memphis Minnie	Queen of the Delta Blues, Volume 2 (E)