Steve was great at improvising songs (he could compose a song from any 3 keys).
So he went into the studio with Jack to provide musical accompaniment on piano to his readings.
They went along for about 45 minutes with the tape rolling. The engineer then asked when they wanted to do a second take and they said that they were done.
I have heard from jazz critics that Fats Waller and his combo once went to the recording studio and reeled off 12 numbers without a single retake. C:<()