The relationships of Michael with his fellow musicians can be described as examples of: voluntary kinship.
Kinship refers to being related to people by blood as their relations from a family or extended family. However, beyond being related as blood relatives, one can decide to have kinship ties with people that are not their relatives but can depend on them as their kin. Hence, the name voluntary kinship.
Therefore, the relationships of Michael with his fellow musicians can be described as examples of: voluntary kinship.
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