The jam session idea goes like this... The soloist goes first, reserving three squares all at once--or two squares with the third between the other two. The soloist does the first three squares on the level--after b2, of course--any three squares will do. Then the other players do their accompaniment--they complete the remaining four squares on that level. And so it goes for three levels. Then another player becomes the soloist. The previous soloist then becomes one of the accompanists.

For this to work, all of the players need to know that SNY or EHO or RUT is the soloist.

I won't hold my breath waiting for everyone to agree on giving it a try.