Re DT entry - it gives 4 different tunes. Out of interest, two were later used as setting for songs in John Gay's ballad opera The Beggar's Opera {1729}

— for the first {Air xii, Act I sc 10} the text gives as title heading "O ponder well, ye parents dear"", another song popular in early C18 set to DT's Chevy Chas tune 1;

the second {Air lxi part of long sequence in Act III sc 13} is actually headed "Chevy Chase", using DT's tune 2.