One thing I couldn't find is a way to change the same element in a number of tags (such as to change the name of an album, when the idiot who entered it into CDDB can't spell, for example) without manually changing each on. Does this feature exist?
Yup. Select one or more tracks in the usual way (click, shift-click, control-click). Then right click on the selected tracks and choose "Get Info". Change whatever you need to in the dialog, click OK. This is obviously the other way to change info on a single track.
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One thing I couldn't find is a way to change the same element in a number of tags (such as to change the name of an album, when the idiot who entered it into CDDB can't spell, for example) without manually changing each on. Does this feature exist?
Yup. Select one or more tracks in the usual way (click, shift-click, control-click). Then right click on the selected tracks and choose "Get Info". Change whatever you need to in the dialog, click OK. This is obviously the other way to change info on a single track.