Musical reassurance

[Monty]

Refers to da cheerful/casual whistling/humming/singing dat youre always super-glad/relieved to hear emanating from a mechanic, carpenter, or other [repairman] as hes working on your in-need-of-fixing item, since this unflustered tune-making indicates that whatever mending/alterations which are required to restore your device are merely [all in a days work] or [old hat] with him; i.e., hes confidently proceeding with the task and is not concerned that there will be any snags. problems, or delays in said repairs.