Johnny Hartman and John Coltrane did an album together , and that 's just amazingly beautiful . They just work so well together , have such amazing respect for each other in the way John Coltrane will sit back and let Johnny sing , then step up at just the right time . Their use of one another 's strengths is fantastic .
Question: What does the text suggest about the frequency with which Johnny Hartman and John Coltrane worked together to create music ?
The answer to the above question:


It hints that the album was the only time that they collaborated together musically .