Thanks Barry.

I think the tremendous collection of single sheet songs with music at the Folger Shakespeare Library were purchased by H. C. Folger because about every 10 years or so a new production of one of Shakepeare's plays occassioned some composer to do a new tune for one of Shakespeare's songs, and these were subsequently issued as single sheet songs with music. Many of the songbooks (almost all from the 18th century) at the Folger Shakespeare Library also contain songs by Shakespeare.