And of course a misheard lyric can with time become seen as the normal version. In Wild Mountain Thyme a large number of people sing at the start of the second verse

I will build my love a *tower* By yon clear crystal fountain And on it I will pile All the flowers of the mountain.

I've even seen it printed in songbooks. The correct word, which then makes the verse actually make sense, is bower, which is the sort of thing you would pile flowers on.