[DaveBlake]

recognize/use "Sort by" tag in mp3s!
I really thought it would be included in v.17

If you mean the ARTISTSORT (TSOP), ALBUMARTISTSORT (TS02) and COMPOSERSORT (TSOC) tags then support for these has been added in v18. Perhaps you would like to test out the nightly?

To see the use you need to (re)scan music files into the library that have at least some of these tags embedded, and then add <useartistsortname>true</promptfulltagscan> to the section of advancesettings.xml. When the artist, album or songs nodes is sorted by artist name it is the sort name that will be used e.g. "Eric Clapton" with sortname "Clapton, Eric" can be seen under "C" for Clapton rather than "E" for Eric.