In other words, who's the most common musician to hold back a rock (folk-rock, rock, metal, etc) band? I've often felt that the drumming is by far the most common thing to bother me about a band and hold them back. So often bands write good songs and perform them well, but then the drumming is just a super repetitive doo-wap doo-wap doo-wap over and over and over again. I rarely think that songs are ruined by too simplistic guitar work or bassists or piano (I often feel kind of bad for the keyboardist in rock groups for having to play such simple notes unless it's Phish or the Grateful Dead of course ). Part of the reason Black Sabbath had such a unique sound was because the guitarist injured his hand and couldn't play fast notes, so he had to come up with songs that allowed him to play slower power chords. Which created a whole new genre of music (of course the very first metal band is a huge debate that will never end) The best example I can think of for an album ruined by the drumming is The Wallflowers' "Bringing Down The Horse" which is full of really well written songs, with great vocals by Jacob Dylan. It's aged a bit yes, but it's really well done. Except the bloody drumming, which just bores me to death and I can't listen to it. doo-wap doo-wap doo-wap on every song. And some albums are kind of made by their percussion, for example the latest Big Red Machine album which is full of really interesting rhythms and percussion that often lead the songs. Or Santana even, with the conga drums. The National and Led Zeppelin are also totally made by the drumming. Both drummers are my two favorite rock drummers of all time, Their sense of timing is unique and they consistently create really captivating rhythms that lay the foundation for the band. With both bands, I would argue that the drummers are the most irreplaceable members of the group (ignoring who is writing the music of course). It's not that hard to find a great guitarist. Finding a drummer like those two is once in a lifetime.