Sometimes it s the artist s call, or the span of time it takes to record a record, and who s available. There is a certain casting call about who s most suited for that style, etc. It s also a question of expertise. People feel safe about a certain amount of experience. If you had to go into surgery, you wouldn t want to go to a surgeon who just got out of medical school.
Time tells the tale.
Knowing who s capable of encompassing a number of different styles, efficiency in the studio, word of mouth. Having a body of work from which to judge over a period of time that has ensued. People are spending huge amounts of money to get their project done. As if on cue, it was time for Michael to go to work. Somebody knocked on the door, and all of the musicians, writers and studio personnel needed to get going.