The only thing I can think of is to make a larger square cake and smaller round cakes decorated like drums....my thought is to put the smaller, I'm thinking like 6" cakes in different heights, maybe using dowel rods covered in fondant,maybe white fondant dusted with silver dusting powder to make it look like a drum set, and if there was some way to angle the cakes just slightly, that would even be better. I don't know how realistic this would be for you or if you want to go to that much trouble.....you could always just decorate a round cake like a drum.
Here's a great snare drum cake I found off of Google. http://www.weddingcakesbykurt.com/g12.html
I thought I just had was to make a 13x9 sheet cake and put a cupcake drum set on top.
Joe
My husband is a drummer and I wanted to make one for him for his birthday. I found this one on this site and emailed the person that did it for instructions, but never got a response. Maybe you could have better luck.
http://www.cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=allby&member_id=26&cat=0&pos=49
My husband is a drummer and I wanted to make one for him for his birthday. I found this one on this site and emailed the person that did it for instructions, but never got a response. Maybe you could have better luck.
http://www.cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=allby&member_id=26&cat=0&pos=49
I e-mailed that same person (cjf) regarding her cowboy boot cake but never got a response either!!! 
Ok, I decided to look at the pic and see what I would do to make this and this is what I came up with..
Layer and fill at least 4 nine inch rounds one on top of each other. Then either ice/smooth with a good crusting buttercream, or what might be better is to cover it in MMF or regular fondant. The silver rims are most likely made out of fondant and then covered in silver lustre dust. The skinny posts in the rods on the side of the cake could be spaghetti or those bamboo skewers stuck in formed fondant and then covered in silver lustre dust...if you had a mold you might be able to make them out of chocolate.... you could make the drum any size you wanted with any type of round cake....
hope this helps.
m0use
Hey everyone,
I am making a 50th birthday cake for a guy who used to play drums and who was also with a marching band. I tried to attach a pic of the drum but it keeps failing. It's a standard marching/drummer boy kind of drum, with a shiny shell, etc - just to give an idea.
I am planning on making a layered round cake sandwiched and crumb coated, etc with b/c and decorated with RTR fondant.
I won't need dowel support will I? I mean it seems straight forward but I don't want it to sink or anything like that.
Any tips or suggestions, etc would be very much appreciated.
Thanks ! 
Three of my kids are percussionists. I didn't really want make a drum set cake for my sons birthday last year.... so here's what I came up with.
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1562548
He really liked it!
Hey everyone,
My cake turned out pretty ok considering!!! The guy whose birthday it was, was delighted with it and I think he even tried to play it!
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