Lulls cap at level 55.
Charm for bards I believe caps at level 51.
Your Snare song however has no level cap, you can CC via kiting like that.
Unfortunately, CC is one of the areas that Velious is really bad for. Giants and Dragons cannot be mezzed or stunned, charm caps 7 levels below max level for enchanters, mez caps basically at level 55/57. Rapture exists but it's not really that useful due to cost and recast for regular group CC.
It wasn't until PoP when they added more Mez/Charm spells that allowed charming up to 62/64 and mezzing up to 68 that the game allowed for CC at the high end.
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