Flow, my tears is a lute song by John Dowland (15631626). Originally composed as an instrumental under the name "Lachrimae pavane" in 1596, it is Dowland's most famous ayre, and became his signature song.
For duet  Flute and guitar. 
Intermediate.
With guitar tablature. With lyrics. With melody line. 
With downloadable mp3's for audio help (one with both flute and guitar, one with guitar only).

Pages: 4 pages (3 pages score, 1 page Flute part), 3:20 min.