  We present the status of MUSIC, the MUltiwavelength Sub/millimeter Inductance
Camera, a new instrument for the Caltech Submillimeter Observatory. MUSIC is
designed to have a 14', diffraction-limited field-of-view instrumented with
2304 detectors in 576 spatial pixels and four spectral bands at 0.87, 1.04,
1.33, and 1.98 mm. MUSIC will be used to study dusty star-forming galaxies,
galaxy clusters via the Sunyaev-Zeldovich effect, and star formation in our own
and nearby galaxies. MUSIC uses broadband superconducting phased-array
slot-dipole antennas to form beams, lumped-element on-chip bandpass filters to
define spectral bands, and microwave kinetic inductance detectors to
senseincoming light. The focal plane is fabricated in 8 tiles consisting of 72
spatial pixels each. It is coupled to the telescope via an ambient temperature
ellipsoidal mirror and a cold reimaging lens. A cold Lyot stop sits at the
image of the primary mirror formed by the ellipsoidal mirror. Dielectric and
metal mesh filters are used to block thermal infrared and out-of-band
radiation. The instrument uses a pulse tube cooler and 3He/3He/4He closed-cycle
cooler to cool the focal plane to below 250 mK. A multilayer shield attenuates
Earth's magnetic field. Each focal plane tile is read out by a single pair of
coaxes and a HEMT amplifier. The readout system consists of 16 copies of
custom-designed ADC/DAC and IF boards coupled to the CASPER ROACH platform. We
focus on recent updates on the instrument design and results from the
commissioning of the full camera in 2012.
