Harmony and form in early beatle songs can include which of the following?

a. songs that adhered primarily to the verse-refrain-chorus-bridge format, though with variations
b. buddy holly-inspired songs in major keys using primarily i, iv, and v chords
c. twelve-bar blues featuring i-iv-v chords all of the choices

All of the choices

Explanation:

Harmony and form in early Beatle songs can include:

- Songs that adhered primarly to the verse-refrain-chorus-bridge format, thought with variations

- Buddy Holly-inspired songs in major keys using primarily I, IV, and V cords

- Twelve-bar blues featuring I-IV-V chords

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