Someone once suggested I wrote a Nine/Rose Phantom crossover

From your remark about singing, I presume you mean the Phantom of the Opera. But Wikipedia's disambiguation page gives a long list of phantoms, including a comic-book superhero and Sir Charles Lytton from the Pink Panther films. Not to mention the Phantom Raspberry Blower of Old London Town and the Phantom Head Shaver of Brighton (hmmm... would that explain Nine's haircut?)

As for your tagging me, I'm not sure, given my minuscule flist, that it's logically possible for me to fulfil the meme conditions.