One of the most popular pieces of classical music is “Orpheus in the Underworld” by Jacques Offenbach. It contains one of the world’s most familiar tunes, though familiar in a different context. Here’s the tune in question, and I doubt if you’ll think of Greek mythology when you hear it.
As for Kalaïs, he lived on for a few more years until, as one myth says, his own past caught up with him. While on the Argo Kalaïs had persuaded fellow Argonaut and great lover of boys Heracles to remain ashore searching for his lover Hylas while the Argo sailed on. Hylas was never found, and Heracles never returned to the Argo. In revenge Heracles killed Kalaïs.