I think your presentation should have some sense of direction. It's okay to use Pepper as the centrepiece, but it would be a good idea to show how influential it was beyond its own time. Look at all the covers by different bands right up to the the present day, not forgetting the 2007 mini-festival the BBC did using different artists to cover all the songs on the album. Also, show how Pepper affected cultural norms, clothing, style, the whole hippie thing. In other words, don't just focus on the album itself, but make sure you show it to be representative of its time, pushing social consciousness in new directions. The title of the project is "The 60s", after all, not "Sgt Pepper", so don't forget that.