A husband fiddles with his old guitar, tuning it again and again, and his wife rolls her green eyes at the habit. That small domestic scene opens the poem, and it feels familiar: the irritation of living with someone's quirks for a very long time.
But the last three lines shift the picture. Thirty years earlier ("three rolling decades"), he tuned a new guitar, and the music he made won her heart. The word "snared" suggests she was caught almost like a bird in a trap, charmed before she knew it.
The poem quietly sets two moments side by side. The same action that now annoys her once made her fall in love. The speaker seems amused and tender rather than bitter, and the repeated "rolling" links her eye-roll to the passing years. The mood is light, wry, and affectionate, hinting that the irritation may be part of a love that has lasted.