I think that Gobi's Valley might be my favorite level in all of Banjo-Kazooie. That's mostly the case due to the music, I absolutely love it, but I also just love the environment of the level, and how it captures the fictionalized version of Egypt very well, but also with some trademark Rare kookiness.
Text, music, and characters are all created by Rare, and owned by Microsoft. The song is Gobi's Valley, composed by Grant Kirkhope for Banjo-Kazooie, but is a remix done by The Jukebox on YouTube: https://www.youtube.com/watch?v=pFofqM4CUkI