What is a series of musical notes that have been strung together?

Melody.

Explanation:

A melody is defined as a sequence of single musical notes that is musically satisfying. It can also be defined as the main tune of a song from the outcome of a series of notes.

These definitions of melody fit the concept requested in the question, as they both refer to a series (or sequence) of musical notes put together.

yes

explanation:

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