Linked from
The 13 pages that link to Asteroseismology, each with the reason it gives.
Stellar rotationRelated: Rotation splits oscillation frequencies, exposing internal spin rates.
Stellar ageRelated: Oscillation frequencies reveal evolutionary state and can sharpen age estimates.
SubgiantRelated: Subgiant oscillations reveal whether hydrogen burning has ceased in the core.
Stellar astronomyRelated: Oscillation frequencies refine stellar ages, masses, and interior models.