Just a week later, he appears on tape sitting at a portable keyboard, tapping out a melody.

I always wanted a great sounding but portable keyboard and I now have one.

Sales of portable keyboards have more than doubled every year since then.

Is it any wonder that more than four million portable electronic keyboards have been sold every year for the last three years?

Thirty times that number of portable electronic keyboards were sold.

For example, nearly all portable electronic keyboards now made are not sensitive to the player's touch.

An organist sat in one chair, playing a portable keyboard propped on another.

(numerous contemporary newspapers) Sometimes he broadcast from airfields with a portable keyboard on the field.

The portable keyboard, which runs on batteries, is 20 1/4 inches long and weighs about three pounds.

He had added a couple of puppets to his act, began using a portable electronic keyboard and maintained the clean edge to his performances.