Capacitors can be ugly little things... Nothing new here, but in case you have not seen it before (or have forgotten, not that that ever happens... )
http://www.edn.com/design/analog/4416466/1/Signal-distortion-from-high-K-ceramic-capacitors
Note -40 dB = 1 %, -50 dB = 0.1 %, -60 dB = 0.01 % THD+N
http://www.edn.com/design/analog/4416466/1/Signal-distortion-from-high-K-ceramic-capacitors
Note -40 dB = 1 %, -50 dB = 0.1 %, -60 dB = 0.01 % THD+N