Kurt Cobain

Cobain used the instrument on two early demo recordings he made at his aunt Mari Earl’s house near Seattle during his pre-Nirvana days. The demos, one recorded under the moniker "Organized Confusion" in 1982 and another in 1985 under the name "Fecal Matter", most die-hard Cobain fans know these demos and the song “Spank Thru” from the 1985 recordings went on to become a staple of Nirvana’s live set and would become Nirvana’s first official song, according to Krist Novoselic.

In this photo, Kurt Cobain is seen playing a Gibson Ripper Bass.

This photo shows Cobain playing a Warwick Dolphin.

On www.kurtsequipment.com in the "Miscellaneous Guitars" section number 11 on the list it mentions Cobain owning a "Lefty Rickenbacker 4001 Bass, natural, which he loved" also in the 2015 Movie "Kurt Cobain : Montage of Heck" on the DVD in the picture gallery you see a picture of Kurt's Rickenbacker 4001 Bass. I believe he used in in early 1994 on the last demos he recorded in the basement of the Cobain residence before Kurt passed away in April 1994.

In the YouTube video "Kurt Cobain - Creation (Upgrade)" by RareNirvana, it is evident that Kurt Cobain recorded a demo in 1987-1988 using an Ibanez 2609B Black Eagle Bass while singing. This bass does not belong to Cobain but to Krist Novoselic, and Cobain played it upside down, as it is a right-handed instrument.