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As DegenerateGunn's solution suggested,"¿Viva la Gloria? (Little Girl)" is probably the best song to do this one, as it seems to have the longest drum solo segment. But, as suggested by someone on the x360a forums (sorry, I didn't note the user name), if you're struggling with this one, pause the game when you see the drum fill coming. Drop your sticks, and put your fingers over the A-X-Y-B face buttons on your drumset controller. Unpause the game, and just hammer on the face buttons. It should be a piece of cake to get 40 hits in this way. Then switch back to your sticks and finish the song. The achievement will pop at the end of the song. I did this on easy, but difficulty shouldn't really matter, as long as you can complete the song.
If you're still struggling with this, remember that you can track your progress on the in-game achievements menu. Scroll down the list to "Tres Cool," and the progress bar will tell you the max number of hits you've achieved. After my first try, I had 38, so I knew I was almost there.
Thanks also to A Wise Ninja and Stumpy25 for suggesting this be made into its own solution.
Hope that helps someone, it worked for me!
