The data in question computes online sales and on-demand streams of 94 Led Zeppelin songs from November 2007 – when their catalog first became available on iTunes – through July 12, 2018.
The streaming data starts from December 2015. The source pointed out:
“It’s important to note that while revenue serves as the basis of the ranking, Billboard only counted revenue where the consumer made a choice, either by downloading a song or playing a stream on-demand.
“That means that other revenue generators – where professionals make choices like which songs to play on the radio, or which song to put in a TV show or to physically release as a single – were not considered because the consumer wasn’t involved in those choices.
“Therefore, this list is a true gauge of the popularity of the songs within the band’s catalog, because the Zeppelin fans’ actions generated the revenue upon which this ranking is based.”
Top 11 Led Zeppelin songs based on earnings from online sales and streams:
1. Stairway to Heaven ($2,903,223.42)
2. Kashmir ($1,421,130.32)
3. Immigrant Song ($1,306,140.94)
4. Black Dog ($1,167,232.19)
5. Whole Lotta Love ($1,034,129.29)
6. Ramble On ($888,793.61)
7. Over the Hills and Far Away ($757,125.57)
8. Goin’ to California ($694,689.56)
9. Rock n’ Roll ($636,985.97)
10. D’yer Mak’er ($553,459.73)
11. When the Levee Breaks ($547,514.60)