Mother Love Bone was the band that most of Pearl Jam cut their teeth on before becoming one of the most popular bands of the 90s. The band included two former members of the band Green River (a great band in their own right) and a future member of the band Mudhoney. This band had been founded to make more arena-styled rock, which you can certainly hear in "This is Shangrila," which could easily pass as a Guns and Roses single.
Mother Love Bone is a perfect bridge of 80s pop metal and 90s grunge pop, even though most of the descriptions of the band list it as glam and/or punk. The band seems to be a perfect encapsulation of the kind of rock music that was popular in the late 80s in other parts of the country in addition to Seattle.
The band had a tragic end: the singer, Wood, died of an overdose. Later on, when interest in Pearl Jam peaked, there was a resurgence of interest in Mother Love Bone.