Indexing with more than one NUMBER per PAGE

Friends,

I know how to make an INDEX that uses page numbers, and it works nicely.

I have been using only one hymn per page.

But, now I want to do a book that (sometimes) has more than one hymn per page.

In other words, "Actual Page 566" might contain Number 566 and Number 567.

"Actual Page 567" might contain Number 568 and Number 569.

In the hymn section (200 pages out of 1100) we will not be listing the "Actual page numbers" because I cannot abide dual numbering systems.

Friends, how can I do this?

Can I assign some sort of numbering system variable to each hymn ?