Final answer:
The statement in the question is false; the song 'Still Alive' is sung by GLaDOS, not Cortana, from the game Portal. The phrase 'the cake is a lie' became a well-known meme from this game.
Step-by-step explanation:
The assertion in the question regarding the song ‘Still Alive’ is false. The theme song ‘Still Alive’ is not sung by Cortana, but by GLaDOS, the artificial intelligence antagonist in the video game Portal. Furthermore, the phrase 'the cake is a lie' indeed became a popular meme as it refers to the game’s narrative, where the promise of cake is used as a recurring motif to entice the player to complete tests, and it is humorously implied that this promise is never to be fulfilled.