Keyboard

Girl playing the Lute by Vermeer, about 1650
http://www.cs.dartmouth.edu/~wbc/icon/vermeerS.jpg

Musician playing a recorder, painting by Jacob Jordaens, 17^th c.
http://www.artunframed.com/images/artmis46/jordaen95.jpg

Baroque lute iconography
http://www.cs.dartmouth.edu/~wbc/icon/1600.html

Baroque musical iconography
http://www.greatbassviol.com/nefg.html

Violin iconography
http://violadabraccio.com/violin.pictures/

Recorder iconography
http://members.iinet.net.au/%7Enickl/art.html

Fugue

First page of autograph manuscript of Fuga movement from Sonata for Solo Violin, No. 3, by J. S. Bach
http://www.jsbach.net/images/fuga.html

The complete Well-Tempered Clavier
http://www.dlib.indiana.edu/variations/scores/abt8726/index.html

J.S. Bach, Art of Fugue, autograph manuscript
http://www.jsbach.net/images/unfinishedfugue.html

Bach, Fugue Bwv 856 autograph manuscript
http://patachonf.free.fr/musique/bach/ms856.htm#bas