Back in the day, Bob Dylan didn’t just make records, he made music – and he did it pretty much all the time, judging from the ongoing stream of archival releases. Offering 74 previously unreleased tracks on three discs, Bob Dylan – 1970 is drawn from the same sessions that produced the charming New Morning and the poorly received covers set Self Portrait, going beyond even the wide reach of those two albums. Along with alternate takes of contemporary Dylan compositions, it features new versions of old originals, including “Song to Woody” and “It Ain’t Me Babe,” and plenty ...