All Saxophone players are required to play comfortably throughout the entire range of the instrument. Solo's are written 'as is' and as such, there may be a requirement to use the harmonic register.
Solos will often contain chord symbols so that the soloist can perform their solo 'ad-lib'. A good understanding of chords will be useful.
Saxophone players may be expected to double Flute and/or Clarinet.
Baritone Sax players may be expected to double on Alto Saxophone and/or Bass Clarinet.