Crabs keep track of all the blocks they've heard, and they will give you better bonuses for playing a block that hasn't been heard as recently. This achievement is specifically for playing the music block that the crab has heard least recently.
There's no way to know what block they have heard least recently, although it's probably a safe bet it's fairly rare. Therefore, this achievement is pretty much luck based, although you can bias it in your favor by using rare music blocks.
"GNG" and "SB-1" are the rarest blocks, as they were created by the devs as a reward (The GNG block for being a beta tester, and SB-1 for... who knows :) although there are enough of them in circulation (and enough people have them specifically for getting this achievement) that sometimes it will be a rare one of the common blocks instead. You can generally gauge how rare a block is by how much they sell for at the auction.
It appears you can only go to hell once per game-day.
You get the debuff Pooped when your energy is very low(5% of max energy) with a duration matching the time until the next game day, which is every four earth hours.
Bureaucratic Arts II allows the player to obtain more types of permits from the Bureaucrats in Bureaucratic Halls. As of now, the only item this enables you to obtain is the General Building Permit, which is consumed in certain phases of Street Projects. BA II is also required in the work stages of certain projects. tl;dr: BA II is only useful for Street Projects, and it is only rarely useful.
It is hinted that in the future more types permits will be added. For example, in the forum post introducing Party Packs, the developers hinted that Parties will in the future require Party Permits which presumably will require BA II to obtain. There also exists the unimplemented skill Bureaucratic Arts III, which hints that the developers may expand the skill tree in this direction in the future.
Best Answer
Crabs keep track of all the blocks they've heard, and they will give you better bonuses for playing a block that hasn't been heard as recently. This achievement is specifically for playing the music block that the crab has heard least recently.
There's no way to know what block they have heard least recently, although it's probably a safe bet it's fairly rare. Therefore, this achievement is pretty much luck based, although you can bias it in your favor by using rare music blocks.
"GNG" and "SB-1" are the rarest blocks, as they were created by the devs as a reward (The GNG block for being a beta tester, and SB-1 for... who knows :) although there are enough of them in circulation (and enough people have them specifically for getting this achievement) that sometimes it will be a rare one of the common blocks instead. You can generally gauge how rare a block is by how much they sell for at the auction.