Batch shifting of columns?

[Ed Jabbour]

I have a bunch of songs from the 20s and 30s that are not part of albums.  
However,  as I was developing my collection (before Amarok), I placed  the 
record label and number under the Album tag.  Thus,  I have an album 
titled "OKeh 41526 Side A"; each "album" is unique.  I'd like to shift that 
tag to "Comment", but one by one would be onerous.  Is there a batch manner 
in which to do it?  As in , "take the selected tags and move them to the 
Comment column".