The street band's song is "It Is So Good Pt 1" by Charlie McCoy (1930). It and Part 2 are reissued on RST Blues Documents BDCD-6018. They were made a bit over a year after McCoy recorded "It Is No Good Pts 1 & 2" (also on BDCD-6018). A month after "It Is So Good" he was back in the studio with the Mississippi Blacksnakes to do "It Still Ain't No Good (New It Ain't No Good)" (BDCD-6013). All are the same tune with different lyrics and some accompaniment modification. Another later (1936) version, sans McCoy, is by Robert Hill (on Document DOCD-5678). Oh, and there's Walter Taylor's "It Ain't No Good", from 1930 (on DOCD-5641).
