Understanding and use of slang expressions are one of the key skills
that separates the great English as a Second language student from the
rest of their classmates. Yes it is true that slang phrases change
from decade to decade but when listening to old audio materials that
involve cultural references for example rock and roll music the need to know older slang
expressions is even more apparent. Slang is found not only in audio materials but also in writing as well.
Slang is fun for the English foreign language student to use making it easy to teach these highly motivated learners.