Which section of the Sonata Allegro form contains both Themes in the tonic key?

The recapitulation is the section of the Sonata Allegro form that presents both themes in the tonic key. In this section, the first and second themes, which were initially introduced in the exposition, are restated. However, unlike in the exposition where the second theme is typically presented in a contrasting key, the recapitulation reaffirms the tonality by presenting both themes in the original tonic key. This provides a sense of resolution and completeness to the musical narrative, reinforcing the structural integrity of the piece. The recapitulation fulfills the function of bringing back the main ideas of the movement while anchoring them firmly in the home key, which is a crucial aspect of the Sonata Allegro form.