Most of the tracks on their first three albums plus all the songs on Mockingbird Time
are credited to the band's guitarist Gary Louris and Olson. We asked Louris if they really did collaborate on all their songs? He replied that "in the early days there was a little bit more of 50/50, and then as time went on and we moved in different places, it become more of I've got this, he's got that, you like this? Cool. Well, what would you change? And there may be slight little tweaks."
When the pair renewed their songwriting partnership for Mockingbird Time
it "became more of a 50/50 thing again because we just sat across from each other and wrote."
He concluded: "But certainly there are Gary's songs and there are Mark's songs, and there are some that are Gary and Mark songs. But I think it was a good decision to just put our names on everything. It was definitely a conscious decision to make it less of an ego thing."(Here's our full Gary Louris interview