No, Wedding hymn is no longer a "combination of two priest hymns" considering priests lost the mana hymn. Otherwise you should also say that Death Knights have a lot of spells that are altered versions of the priest spell "devouring plague".
Either way, attack "wedding hymn" and "reverberating hymn" all you want. In the end, it's a pointless endeavor from your part, since we're not saying those two particular spells would be present in a bard's repertoire, but just pointing at them as proof that spellsongs as a concept exist, therefore making the concept of a spellsinger bard possible.
You could try to find one that supports your claim. But I'm not holding my breath.I don't raid as a Rogue, so you'll be waiting by the phone for a long time.
None of that matters, so you pointing that out is pointless.You can't in Eastern Kingdoms, Kalmidor, Northrend, Panderia, Outland, Draenor, Vash'jir, Deepholm, Highmountain, Stormheim, Val'sharah, Suramar, Argus, or Azuna.
So what's the point?
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It is not. This is just you strawmaning.