  Gravitational wave astronomy opened dramatically in September 2015 with the
LIGO discovery of a distant and massive binary black hole coalescence. The more
recent discovery of a binary neutron star merger, followed by a gamma ray burst
and a kilonova, reinforces the excitement of this new era, in which we may soon
see other sources of gravitational waves, including continuous, nearly
monochromatic signals. Potential continuous wave (CW) sources include rapidly
spinning galactic neutron stars and more exotic possibilities, such as emission
from axion Bose Einstein "clouds" surrounding black holes. Recent searches in
Advanced LIGO data are presented, and prospects for more sensitive future
searches discussed.
