The Bass Jam is a Pseudo Song created to describe an instrumental section in many Communication Breakdown medlies from mid 69 up to September of 71. It was performed on and off during this period.
The golden era of the Bass Jam was September of 1970 when it sometimes led into or out of the very rare performances of Good Times Bad Times most famously at the Los Angeles Forum on September 4th 1970.
The Bass Jam is not really a Bass solo in most cases as the guitar and drums were still following along the groove. Defining the beginning and end of the performances was a judgement call, but I basically tried to map out the sections where Jones stopped playing the bassline of the song and started improvising off on his own. Basically he started to solo while the band was still playing and they would pull back and let him take the lead for a while.
The single performance of this song after September of 71 was during an off the cuff imrpovisation during the accoustic set at the Seattle Kingdome in 1977 when Plant and Jones passed the time while Jimmy changed a broken string. This particular acoustic performance of the song is completely unlike all of the other performances of the song, but it was a Bass Jam of sorts so I included it in the list.