World Bird List

Species factsheet
Sombre Greenbul (Andropadus importunus)

Order: Andropadus importunus
Family: Bulbuls (Pycnonotidae)

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
insularis s Ethiopia and s Somalia to e Tanzania
importunus highlands of n South Africa, w Swaziland s along coast to Western Cape
oleaginus s Zimbabwe, s Mozambique and lowland n South Africa
hypoxanthus se Tanzania to c Mozambique, c Zimbabwe and sc Zambia