Hello Andy,
In answer to your first query, it's all about evidencing research, which can include all of the suggestions that you've listed, texts written about or by composers or your own observations of their scores etc.
As for your second query, it's for each student to make their own selections. So if you think that you can evidence meeting the learning outcome in three parts, then it would make sense to select three learning log entries that reflect those aspects you have categorised.
Hope this helps Andy.
In answer to your first query, it's all about evidencing research, which can include all of the suggestions that you've listed, texts written about or by composers or your own observations of their scores etc.
As for your second query, it's for each student to make their own selections. So if you think that you can evidence meeting the learning outcome in three parts, then it would make sense to select three learning log entries that reflect those aspects you have categorised.
Hope this helps Andy.