probably "nanorobot tune" from Machinarium, the game, when he tries to look cool,
"visitors from dreams" by DMA-SC or "robots FTW" from Portal 2 Soundtrack for excited/ happy/energetic.
"mr. handagoat" from machinarium soundtrack for casual
"buster", "pink chocolate", and "tetrobot"from Blocks that Matter soundtrack or "gameboy tune" from Machinarium Soundtrack for curious
"Black cap brotherhood theme" from Machinarium Soundtrack for drunk
"the glasshouse with butterfly" from Machinarium Soundtrack or "the earth at night" from Osmosis Soundtrack for asleep.
"star" from blocks that matter soundtrack for creative
probably "divine combat" and "sacrifial" from the binding of isaac soundtrack for fighting/angry
EDIT: "pain fade away" from darwinia soundtrack for so cheerful im in my own happy place not paying attention to you mood.
Source: Bzprpg News And Discussion
becAAuse nuju metru said not to post in the topic, im blogging it.
discuss the songs and if you dont know them listen 2 them