Noah and Mio - Our Melody

Noah and Mio - Our Melody is Disc 8, Track 16 on the Xenoblade Chronicles 3 Original Soundtrack and Disc 19, Track 16 on the Xenoblade Chronicles Original Soundtrack Trinity Box.

It is a combination of the A sections of Off-Seer - Noah and (from 0:21) Off-Seer - Mio — similar to A Life Sent On but with no additional instrumentation, stopping at the end of the A section, and beginning with Off-Seer - Noah rather than Off-Seer - Mio.

It plays in the post-credits cutscene after time resumes. Noah apparently hears the piece in-universe, although its source is left unclear.