ninaballerina wrote:Is there a way to remove piano that plays melody in Ravel's arrangement of Bolero? (or flutes from the official orchestral version?)
Short answer - no.
Longer answer - the "Vocal Remover" effect (sometimes) works by removing what is common to both tracks (i.e. the vocals), leaving behind what is different (i.e. the instruments). This works only
if the vocal is panned dead centre of a stereo mix (so that the vocal is identical
in both left and right channels) and the instruments are not dead centre (therefore different in one channel to the other.
In the case of the piano in Ravel's arrangement of Bolero, the piano is usually positioned a little to the left of centre, but more importantly the recording is invariably made in a concert hall (or simulated concert hall) in which there is a lot of "reverberation" (short and complex echoes). The reverberation tends to spread the sounds of the instruments, including the piano, so that the sounds become blended across the stereo field. They merge into a single sound with only limited stereo separation.
ninaballerina wrote:The easiest would be to find Music Minus One version of Bolero but it does not exist.
Another possibility would be to find a MIDI version of Bolero. MIDI files are like musical scores for synthesizers with each instrument sound having its own "line". Although MIDI music, being synthesized, rarely sounds "convincing", this option may be better than nothing. If you play a MIDI file in a media player that supports MIDI (such as Windows Media Player or QuickTime), the full "score" will play all together. However, there are programs called "MIDI Sequencers" which are able to edit MIDI files, and (key to this suggestion) are able to play only selected tracks (instrument sounds) and mute others.
Some free MIDI sequencers: Muse
(Linux only), Rosegarden
(Linux only), Quartz AudioMaster
(Windows. Their website appears to be dead, so the link is to the program on brothersoft), Garage Band (not actually "free" but included with most Macs).