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Those shapes are constructed from soft 304 stainless steel and feature a milled microgroove face pattern designed to promote a more efficient roll and a softer feel.

It was only with the development of microgroove technology after World War II that a new generation of cutting head came into use.

The heavy, folded kraft paper used to protect 78 r.p.m. records left marks on the vinyl microgroove when 33 1/3 r.p.m.

But the children's market still offers more than a few moments of genuine magic on microgroove.

While in the early days of the microgroove decade the 45-r.p.m. disk was the major vehicle for pop singers, all of the more imaginative pop and show tunes are now recorded on LPs.