Linked from
The 15 pages that link to Band structure, each with the reason it gives.
Brillouin zoneNarrower topic: The zone supplies the standard wave-vector domain for periodic solids.
Fermi levelRelated: Band edges locate the Fermi level within or between allowed energies.
Bloch's theoremRelated: It is computed by solving for Bloch eigenstates across wavevector space.
Tight-binding modelNarrower topic: The model's central output is the dispersion of electronic bands.
Lattice models in condensed matterRelated: Periodic lattice motion produces energy bands and gaps.