Vocal on same note, different vowel: tied?
If the vowel sound changes on the same pitch, could it be tied?
I like the way that the tie implies only a change in timbre. This is my transcription of Alanis Morissette's "You Oughta Know", four bars into the breakdown after the second chorus (around 3'40", or bar seventy).
So I'm wondering whether every element of tied notes must be identical by definition.