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I figured this out on my ukulele, so sorry for any mistakes, but I think it sounds about right. Especially since she played it on a keyboard. Enjoy! ^-^
AmDeerstalker at the ready. DmCareful, feeling unsteady. E7Must be the poison in my Amblood. AmTaxi, I'm in a hurry. DmWatson, no need to worry. E7Gadzooks! Irene is in the Amnud!
Chorus:
AmI aGm Dsherlocked, DmCanFnot Amstop. AmWaiGting, Dwatching. Til the Dmpenny F7finally Amdrops.
AmLestrade! The clue's right there look! DmSomething that you have mistook! E7You see, but you do not obAmserve. AmOh no, it's Moriarty DmBeat him, let's have a party. E7By jove! He's back he's got a Amnerve!
AmI aGm Dsherlocked, DmCanFnot Amstop. AmWaiGting, Dwatching. Til the Dmpenny F7finally Amdrops.
AmMolly, completely smitten. DmWhat's that? A glowing kitten? E7Sorry, but rabbit wouldn't Amscan. AmBig heist and daring bank raids, DmFriendships, farewells to be made. E7Sherlock, you'd better have a Amplan.
AmI aGm Dsherlocked, DmCanFnot Amstop. AmWaiGting, Dwatching. Til the Dmpenny F7finally Amdrops.