Compared with the 2004 version, the 2010 mix has different instrumentation, such as having a piano backing instead of a synthesizer.

The two movements are nearly identical, in fact, except that this movement has a different instrumentation and key.

The song was re-recorded for its single release, with new vocals and different instrumentation.

Mass of the Children exists in two different instrumentations.

Coverage data obtained in different instrumentation or test runs can be merged.

The ending theme, while the same song as the intro, is played with different instrumentation.

Some of the songs were stripped down and recorded with different instrumentation than previous recordings.

The movements show different instrumentation, to ensure variety in spite of only one singing voice.

There is an alternate mix that lasts 5:45 and features slightly different instrumentation.

As far as modern practice goes, the matter is complicated by the very different instrumentation of today.