A is not an admin task. It is the design decision that determines whether the year-end is easy and whether the decisions are good.
Most bookkeeping software ships with a generic chart of accounts, travel, office costs, professional fees. Apply it unchanged to a working musician and you get a that tells you nothing useful. Every income line collapses into 'turnover'. Every music cost drowns in 'overheads'. The accountant can file from it, but the artist cannot run from it.
The job, as a bookkeeper supporting a music client, is to design a chart that separates the income , flags the commission structure, and isolates the costs the artist controls, so the year-end takes an afternoon rather than a month, and the conversation with the client is about decisions rather than reconstruction.