  We have carried out new, high-frequency, high-time-resolution observations of
the Crab pulsar. Combining these with our previous data, we characterize bright
single pulses associated with the Main Pulse, both the Low-Frequency and
High-Frequency Interpulses, and the two High-Frequency Components. Our data
include observations at frequencies ranging from 1 to 43 GHz with time
resolution down to a fraction of a nanosecond. We find at least two types of
emission physics are operating in this pulsar. Both Main Pulses and
Low-Frequency Interpulses, up to about 10 GHz, are characterized by nanoshot
emission - overlapping clumps of narrow-band nanoshots, each with its own
polarization signature. High-Frequency Interpulses, between 5 and 30 GHz, are
characterized by spectral band emission - linearly polarized emission
containing about 30 proportionately spaced spectral bands. We cannot say
whether the longer-duration High-Frequency Component pulses are due to a
scattering process, or if they come from yet another type of emission physics.
