I feel that Edward Lear went all the way into the imaginary worlds he created.

I wouldn't actually call them "whimsy," because I think that they were real for him in a way that, say, Carroll's were not quite. "The Owl and the Pussycat" I suppose is his best known, but there is a plenitude of them, easily found in collections on the net.

In addition to his wonderful illustrations, according to Wikipedia he was a versatile musician who also composed tunes for his poems. Unfortunately, only those of "The Courtship of the Yonghy-Bonghy-Bò" and "The Pelican Chorus" survive. The former poem is on youtube as a song, but I do not know if it is Lear's tune.

I said "unfortunately," but for someone with a gift for musical fantasy, his poems present a great opportunity--one that others have seized.