World Bird List

Species factsheet
Olive-winged Bulbul (Pycnonotus plumosus)

Order: Pycnonotus plumosus
Family: Bulbuls (Pycnonotidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
porphyreus w Sumatra and islands
plumosus Malay Pen., e Sumatra, Java, Bali and w and s Borneo
hutzi n and e Borneo
hachisukae islands off n Borneo and sw Philippines