Can anyone identify which famous song features this phrase?

The band in question was originally known as the New Yardsticks but were forced to change the name. The story goes that one suggestion was decried as a “lead balloon”. The “a” got dropped from ‘lead’ (to prevent a pronunciation of “leed”) and the “balloon” got replaced by “Zeppelin” – hence “Led Zeppelin”.
Why the interest in Led Zeppelin? (I was always more of a Deep Purple man myself (think “Smoke on the Water” with all those air-guitar opportunities! (well, it was the 70s?))
Friedrichshafen (where I stayed overnight) turns out to be the home of the Zeppelin – and of a wonderful museum that tells the story.
More of that in a separate post.
The song was Stairway to Heaven – featured on LZ IV, which sold a staggering 37 million copies.