Without a doubt this is the highest concentration of hard boulder problems in Eldorado Canyon. There are a dozen or more beautifully formed boulders scattered throughout the ridges to the south of Eldorado Canyon Trail. The setting is peaceful and blissfully quiet (let's keep it that way, please leave the music at home!).
It is best to go with someone who knows the area well. The approach is described in Colorado Bouldering 2 by Benningfield and Samet. The boulders are scattered on the ridges to the south of the Eldorado Canyon Trail after you pass the Rincon cutoff and the trail levels out. A couple of the boulder are visible on the ridge lines but most are hidden in the trees. It is very easy to walk right past a classic boulder and not even see it because of the contour of the land and the junipers.
I named these the musical boulders way back in the '70s listening to a song by Peter Gabriel (Genesis) called the "Musical Box". I was on a bouldering roll, sent a load of problems, 5.13 style, and the song played in my head, before Walkman, before iPod, and so I named them the "Musical Boulders" way back when.