南笙几何北萧几梦
[nán shēng jĭ hé bĕi xiāo jĭ mèng]
The phrase combines elements of geography (north and south) and traditional instruments (flute in the north, pipes in the south) while adding a touch of dreams and memories. It conveys a sense of nostalgia and poetic reminiscence, perhaps alluding to distant or unattainable memories.