That joint with phonte and elzhi, a couple joints off his Jamla compilations.
I listened to his tape with kweli and it was a lot of

all around.
I'm gonna listen to his tape with Murs tho.
Fact is no matter how bad 9th fell off, I'm gonna listen to his shyt off the strength of his run from the early 2000s. Back then when you saw a CD that said x and 9th wonder you were guaranteed to hear some dope beats and a random Phonte feature. I really can't tell the last 9th project I liked all the way through(granted I haven't listened to rhapsodys stuff because I can't get down with her style, I have a hunch he's saved his best beats for her), probably Jean Grae jeanius is the last one I liked.
The Murs tape is better than the last one they did IMO. You can tell 9th got new hardware for this project with Murs IMO.
I also think he uses his best beats on Rapsody. Jamla projects got released left and right (every month) for free from 2010-2012, and then all the artists basically had releases you had to pay for in 2012. After that, a few have dropped more releases and others haven't.
If others had popped off as much as Rapsody IMO they'd still get lots of heaters. Like, Big Remo IMO has gotten the best 9th beats in history overall, but I guess Sleepwalkers (2012) didn't do much, because he hasn't released anything since then. He left the Jamla in late 2015 (not sure why). Skyzoo and Thee Tom Hardy also left Jamla a few years ago, but I don't know why. Enigma and Sundown must be in different places in life/music, because they (Actual Proof) haven't dropped a project since 2012 and only ad one (older) song on that Jamla is the Squad tape. TP only did one tape in 2011 and nothing since, but he's still on the website and was on the compilation too. Sean Boog retired from music to run the label.
Rapsody is definitely
THE artist over there right now, followed by Add-2 from Chicago who got added in late '13. From the original crew it seems like HaLo, and GQ are the main ones besides Rapsody. I guess Heather Victoria also.
elaborate

I didn't know producers had a "Prime"
I know you weren't asking me, and I used to never think about it, but actually I sort of wonder with any artist if there isn't a "prime" period. I think with music making people can always grow and find new sounds and revisit styles and have various hot streaks. But if someone thought that producers had a "prime" I don't know if I'd disagree.
I started thinking about it when Quentin Tarantino said he'd like to do 2 more movies and call it a wrap, since he doesn't want to overstay his welcome and he thinks that everyone has their time and their run of good ideas and then the well runs dry.
But music is infinite so it may not apply. Alchemist is my personal favorite producer and he was getting a little stale around the ate 00's and switched his style up and started improving IMO, so who knows.