JT & Bruno do seem to be shifting to more of a real instrumental sound, even a big band sound, but definitely more horns. On the other hand, Beyonce seems to be shifting away from her tour band that included horns & sax to more rap and more computer generated noises (sorry, I just can't call what we heard yesterday musical sounds).

Muse may be incorporating electronic effects to their sound, but the sound is still being driven by real live playing of the instruments. And each person is playing his own instrument in symphony with the other players. 

On the other hand, instrumentation for studio recorded solo artist pop music tends to be created by the producer on a computer. He can create each instrument's sound separately and combine them together in the music production software. He could even create the horn sounds by playing the notes on a keyboard and the computer software will convert it to the sound of a horn. But no computer will ever be able to exactly reproduce all the nuances of sound produced by someone playing the real instrument. The producer can add to the instrumental layering or take away from it to tweek the instrumentals to exactly what he wants. And he can add sounds that don't sound like any instrument at all. It is not created by a synergy of musicians playing together and feeding off of each other in the way that Adam feeds off of the live instrumentals and the audience.

According to the Trespassing CD liner notes, Nile plays guitar on Shady and Tommy added some "additional guitars" (in addition to the computer generated guitar sounds) to Cuckoo. No other instrumental credits are given. From this I would surmise that everything else on Trespassing was computer generated instrumentals created by the producer of that song. Then Adam asked Brian to figure out a way to transform this computer generated instrumentals to something that would sound good on real live instruments. This is really different than the way acts that record as a band create music.

ETA: Part of my original point is that the songs that Queen & Muse play were created to be great rock instrumental music combined with great singing, often with the instrumentals being the more important (i.e. all the great guitar solos). On the other hand, the live instrumentals on Adam's music were created to mimic computer generated pop music and to support a great singer. Great instrumental music was not as important as the great singing. I don't think that this type of music lets the instrumentalist shine in the same way that the band created music lets the band members shine. This is another part of why I think the comparison of Adam's backup band to Muse or Queen is not so fair.

Except for Spike Edney and his Korg Kronos, which can duplicate entire symphony orchestras and all the choirs of heaven and everything in between.