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

The Science Case for ALMA Band 2 and Band 2+3