Suprateep:
Can I make a suggestion to the above list?
If you wish to check the midrange response of amp/speaker/system, you ought to have the tracks with following three instruments (best if the track contains ONLY one instrument at a time)
1. Vocals. Yeah I label these as musical instruments only
2. Orchestra consisting mainly violin/cello pieces
3. Overdriven/distorted guitars (mainly in rock / metal music)
Pink Floyd guitars won't do any justice to the midrange, and George Benson is mainly clean guitar (which is mostly bass and treble/high midrange).
Would recommend adding some Paganini/Vivaldi for violins, and some hardrock number for checking the guitar midrange punch in the system.