As film score fans hope that the year closes with a strong showing of archival soundtrack reissues, a trio of European titles, cannily taking advantage of European copyright laws, have rounded up a host of rare early material from legendary composer John Williams. The U.K. label Jasmine has two CDs available to purchase featuring some of Williams’ least-known material: the compilation John Williams in Session 1956-1961, and a disc combining early albums Checkmate and Diamond Head. Meanwhile, French label  Frémeaux & Associés is prepping Intégrale John Williams: Jazz et musiques de films 1957-1962, a…