The present status of soft hadron production in high energy heavy-ion colli
sions is summarized. In spite of strong evidence for extensive dynamical ev
olution and collective expansion of the fireball before freeze-out I argue
that its chemical composition is hardly changed by hadronic final state int
eractions. The measured hadron yields thus reflect the primordial condition
s at hadronization. The observed production pattern is consistent with stat
istical hadronization at the Hagedorn temperature from a state of uncorrela
ted, color deconfined quarks and antiquarks, but requires non-trivial chemi
cal evolution of the fireball in a prehadronic (presumably QGP) stage befor
e hadron formation.