Use the -name=> parameter of the textfield routine. Name each parameter in such a way, that you can easily deduce which column and which CD it belongs to.

For instance, you could use:

$q->textfield (-default=>A,-name=>"title_$cdnum"),$q->textfield (-defa
+ult=>""-name=>"artist_$cdnum")
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Then, as you iterate through param(), you can determine for each field where it belongs, and process it accordingly.