  We prove a multivariable elliptic extension of Jackson's summation formula
conjectured by Spiridonov. The trigonometric limit case of this result is due
to Gustafson and Rakha. As applications, we obtain two further multivariable
elliptic Jackson summations and two multivariable elliptic Bailey
transformations. The latter four results are all new even in the trigonometric
case.
