Yes. You've found the siamang (Hylobates syndactylus).
The siamang belongs to a family of apes called gibbons, and is
well-known for its morning songs in the rain forests of the
Malaysian peninsula and Sumatra. Male and female pairs sing a
duet for about a half-hour to help establish their territory
to other siamangs in the area.
Siamangs, who live their entire lives in the treetops, mate
with one partner for life. They mostly feed on fruits,
flowers, and young leaves. Siamangs face threats from logging
and agricultural practices that shrink the forest, and from
poachers seeking them out for the pet trade.