  We discuss the science drivers for ALMA Band 2 which spans the frequency
range from 67 to 90 GHz. The key science in this frequency range are the study
of the deuterated molecules in cold, dense, quiescent gas and the study of
redshifted emission from galaxies in CO and other species. However, Band 2 has
a range of other applications which are also presented. The science enabled by
a single receiver system which would combine ALMA Bands 2 and 3 covering the
frequency range 67 to 116 GHz, as well as the possible doubling of the IF
bandwidth of ALMA to 16 GHz, are also considered.
