World Bird List

Species factsheet
Dark-capped Bulbul (Pycnonotus tricolor)

Order: Pycnonotus tricolor
Family: Bulbuls (Pycnonotidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
spurius s Ethiopia
layardi se Kenya to e, s Zambia, ne Botswana and South Africa
tricolor e Cameroon to DR Congo, s Sudan, w, c Kenya, Angola, nw Botswana and n, w Zambia