If you don’t understand, “Also Sprach Zarathustra” is German for “Thus Spoke Zarathustra”. The joke is it can also be read as “‘Also,’ Sprach Zarathustra.” (‘Also,’ spoke Zarathustra.)

This piece (Sunrise) is most well known for its use in the opening of 2001: A Space Odyssey.

https://en.m.wikipedia.org/wiki/Also_sprach_Zarathustra