Long live the cassette tape!!
Although, these days buy original blank NOS tapes on Ebay, as modern examples are crap in comparison. If anyone has done the comparison, the difference in sound quality is night and day!
Obviously, tape formulation materials and methods aren't what they use to be when cassettes were in their heyday... One can draw the same parallels with valves, and even a lot of hi-fi equipment. Is there a message here, I wonder?
My current favourite for the CR-7 is TDK SA60 and SA90, 1987 vintage
Marco.