Of late two dainties were before me plac'd 
Sweet, holy, pure, sacred and innocent, 
From the ninth sphere to me benignly sent  
That Gods might know my own particular taste: 
First the soft Bag-pipe mourn'd with zealous haste, 
The Stranger next with head on bosom bent 
Sigh'd; rueful again the piteous Bag-pipe went, 
Again the Stranger sighings fresh did waste. 
O Bag-pipe thou didst steal my heart away --  
O Stranger thou didst re-assert thy sway -- 
Again thou Stranger gav'st me fresh alarm -- 
Alas! I could not choose. Ah! my poor heart 
Mum chance art thou with both oblig'd to part.
John Keats
http://www.poemhunter.com/poem/on-hearing-the-bag-pipe-and-seeing/