It's amazing what you can stumble across on YouTube.

Of all the songs by the great Jimmie Rodgers, the greatest IMO is Blue Yodel #9, in part because Louis Armstrong played trumpet on it. Two musical legends playing together, how could it not be great?

Fast forward to 1970, and the Johnny Cash Show. Johnny used to show to set up duets with some of his favorite musicians. Here he and Satchmo team up to recreate some of the magic of that classic song. Again, two musical legends playing together, how could it not be great?

• Louis Armstrong and Johnny Cash - Blue Yodel No 9

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