...but I'm not surprised that music with more acoustic instruments would sound sweeter coming out of a tube hybrid and an HD 650 than it does on the LCD-1, although I did briefly listen to the end of Harrison's solo at the end of The End and it didn't sound grating to me, honestly - but definitely clear and uncolored and somewhat aggressive, but I attributed that to the recording itself as it didn't sound much tamer to me from the HD 650.
What volume were you listening at?
You hear aggressive, I hear harshness.
Note that Flying Lotus, Kendrick, and Heliocentrics are all electronic music, and detail is nice. The jazz and classical selections sound better to me on the 6xx.