A Couple of questions?
- What is the format of your file names ?
Example Artist - title.mp3 ?
- Which Tags are you trying to fill ?
There are a lot !!! Example: Artist, Title, Composer, Album, Track No, Genre, Album Art, Publisher, Lyrics etc etc etc
350 aint a lot I'm manually doing around 20-30 a day, so that means only 10-15 days. And I'm Tagging music files ranging from 1930 - 2011. And I still have around xxxxx files to go.
In whole honesty, Manual tagging is the only way to do it, as (maybe) you will want to know (I do) if a song comes from it's own album or from a greatest hits album or was just a single release)