Articles
Traditional music of Indonesia
A try to introduce into to the actual state of music, written by Ingo Stoevesandt

"The Terminology of Batak Musical instruments in Northern Sumatra"
An article by Artur Simon

"Traditional music of Timor L'Este"
Some information provided by Ros Dunlop

http://www.balimusicanddance.com/
A nice collection of articles collected by Wayan Pon Semara

http://www.parenbonjour.com/2011/12/traditional-music-instrument-from.html
A good blog about the Sape written by Paren Nyawi

http://www.budgetbali.com/culture_balinese_music.php
A short introduction into Balinese music and some links to Gamelan performance groups

http://alek.zipzap.ch/gamelan/navi_eng.htm
A nice link collection about Gamelan music.

http://muse.jhu.edu/demo/asian_theatre_journal/v016/16.2cohen.html
"The incantation of Semar smiles": A rich article about the Tarling Style written by Pepen Effendi

Playing AngKlung
A small essay about the famous Balinese instrument

The Boatlutes of Sabah
An article written by Jacqueline Pugh-Kitingan

"Employing strategies to interrogate muscial change"
"Mola' a revisited: Reef panpipes" interview and video of Solomon researcher Peter Ian Crawford 

Pupuh Gambang: Manuscript, Melody and Music
A dissertation written by Jonathan Stuart Adams

http://sulawesistudies.blogspot.de/2005/09/comparison-of-music-of-philippines-and.html
A comparison between Sulawesi and Philippine musical traditions by  Mohammed Amin

Gongs, bells and cymbals: the archeological record in maritime Asia
A very interesting article following the traces from the 9th to 17th centuries, written by Arsenio Nicolas

Is Eastern Insulindia a distinct musical area?
A very interesting article written by  Philip Yamnpolsky