I think the key is you need to find FOSS software that works for you before migrating your OS. Most FOSS software will run on windows and sometimes MAC.
1-2 and 3 will be hard. You can find many tools that do something similar but it won’t be perfect. There are a few different music managers, and for office libreoffice is the go to.
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try digikam, it supports all OSes
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googling “Fujitsu snap scanner Linux” yielded a few blog articles on the matter. Seems it should be supported.
Agreed. You need to be willing to migrate to FOSS software or else “switching to Linux” will be a total failure.