Old MacDonald had a bias
E I E I O
And at that bias he looked again
E I E I O
With a big cat here and a horse guide there
Here is scarlet
There for each
Everywhere are ions
Old MacDonald flew too close to the sun
E I E I O
Can anyone give me the three words that explain Old MacDonald's apparent decent into madness?
Hint:
The three words don't form a phrase or sentence, but are instead independent words linked only by a common feature.
Hint 2:
The three words a pretty uncommon (one in particular) and range between 10 and 12 letters long. However, there's a key clue that means if you get one it should lead you to all three (possibly with a little help from online tools)...