Singles Chart Meilleures positions des singles de Led Zeppelin: Good Times Bad Times: « RPM 100 Top singles », RPM, vol. 11, no 7, 14 avril 1969 (lire
Professional MKII sur HowManyMoreTimes, le bottleneck sur You Shook Me, Dancing Days, In My Time of Dying, une pedal steel guitar dans Your Time Is Gonna Come