3M Brand (imprint for 3M Cantata music)

This label is used for 3M Brand-labelled music; such as cartridges for the Cantata 700, and conceivably the Cantata Mark II. Later cartridges were released as "Music Programmed for Business" on a rental base instead of being sold, containing up to 1200 titles.

For more information, the webpage at the Museum Of Obsolete Media and a Billboard article about the Cantata Mark II might be good places to start.