Notes on Strings and Higher Spins
  These notes are devoted to the intriguing and still largely unexplored links between String Theory and Higher Spins, the types of excitations that lie behind its most cherished properties. A closer look at higher-spin fields provides some further clues that String Theory describes a broken phase of a Higher-Spin Gauge Theory. Conversely, string amplitudes contain a wealth of information on higher-spin interactions that can clarify long-standing issues related to their infrared behavior. 
A. Sagnotti (Scuola Normale Superiore and INFN - Pisa)
hep-th gr-qc