The figurative language device shown in the bolded words "Resounds like sweetest music to my ear" is a **Simile**.
Here's why:
1. A simile is a figure of speech that directly compares two different things using the words "like" or "as" to create a vivid image or connection in the reader's mind.
2. In this case, the phrase "Resounds like sweetest music to my ear" compares the sound of their merry laughter to the experience of hearing the sweetest music. The use of "like" in the comparison indicates that it is a simile.
3. By using a simile, the writer is able to convey the idea that the sound of their laughter is not just pleasant, but as enjoyable as listening to the most beautiful music, emphasizing the joy and happiness of the moment.
Therefore, the figurative language device in the bolded words is a simile.
