  Through ab initio approaches in nuclear theory, we may now seek to
quantitatively understand the wealth of nuclear collective phenomena starting
from the underlying internucleon interactions. No-core configuration
interaction (NCCI) calculations for p-shell nuclei give rise to rotational
bands, as evidenced by rotational patterns for excitation energies,
electromagnetic moments, and electromagnetic transitions. In this review, NCCI
calculations of 7-9Be are used to illustrate and explore ab initio rotational
structure, and the resulting predictions for rotational band properties are
compared with experiment. We highlight the robustness of ab initio rotational
predictions across different choices for the internucleon interaction.
