In a major key, major triads can be built on which scale degrees?

Question

first

fourth

fifth

all of the above

Answer 1

In a major key, major triads can be built on the first, fourth, and fifth scale degrees. Therefore, the correct answer is all of the above.

To elaborate:

• The first scale degree (I) is a major triad.
• The fourth scale degree (IV) is also a major triad.
• The fifth scale degree (V) is a major triad as well.

So, all of these scale degrees can form major triads in a major key.