Samples files come from here
To write tags to files you can use lltag:
lltag sample.* \
-a "Test Artist" \
-t "Test Title" \
-A "Test Album" \
-n "3" \
-g "Jazz" \
-d "2000" \
-c "Test Comment" \
--tag ALBUMARTIST="Test AlbumArtist" \
--tag COMPOSER="Test Composer"\
--tag DISCNUMBER="02" \
--tag TRACKTOTAL="06"