As posted in another thread. Bomb fuses will only light after they've been placed down, rolled or thrown. This gives you more time to line up the shot. It's nothing new, just a little feature that's been overlooked.
The muscial instrument featured in the game is a harp/lyre. It is confirmed to be Shiek's harp from OoT. To play you hold the Wii remote and strum with the nunchuck to play specific paterns of notes. This is not different tones, like the howling in TP, but similar to the Ocarina controls and function from the N64 games.
You know, that's the only image we have of that thing. The thing resembles a cetacean in that it doesn't have legs and is massive. For all we know, this is a giant turd ball.
There's probably some other subconscious ticking going on in the background, in that it leaps up like a fish and we rationalise that there's water beneath it because our Earth is covered mostly by water. Hence, whale.
But going by this picture, it could just as easily be the back end of a pineapple painted brown with teeth. I'm sure there's been more WTF in Zelda before.