When learning to count by eight, the bestselling musician might not immediately come to mind, but teacher Faith McPeek used Swift's famous music to create a memorable teaching rhyme.

Duolingo announced that it will launch new math and music learning programs as the latest addition to its language-learning platform.

Duolingo is best known for its language learning app, but it recently branched into teaching math and will soon offer music lessons.

Android users can now access Duolingo's Music and Math lessons, which were first announced last year. The lessons, which have been available on iOS since last year, can supplement learning, but ...