I’ve often wondered about this because I’ve seen all manner of capitalisation, and contemporary song title transcribers often go for blanket caps for initial letters of words (if that is the correct term) possibly through ignorance of the conventions or Because It Looks Better with no seemingly arbitrary peaks and troughs assaulting the eye.
LH, particularly, will know about this I reckon in his Capacity as an Editor.
I didn’t understand this part from the above link or why it should apply:
Capitalize all the other words except for a, an, the, and conjunctions and prepositions of four letters or fewer.
Why four letters or fewer? Who decided this and when and why? We Need to Talk About Kevin but not We Need To Talk About Kevin nor We Need to Talk about Kevin.