Stem Mastering
It can often be of great benefit to master from STEMS (stereo submixes), especially when one does not have confidence in the mixing environment or lacks the engineering experience or tools to perfect the mixes. In this case, the mix engineer would get the mix as perfect as possible and then, rather than recording the entire mix at once, would record individual stereo submix tracks consisting of, for example, Drums, Bass, Keyboards/Guitars, Lead Vocal, and any sweetening, such as Strings, Horns, etc. These elements should be recorded from the exact same start time so that they can be brought into a new project, moved to time zero with all faders at 0dB, and will accurately represent your mix. This approach allows much greater flexibility in fixing serious problems than does mastering a full stereo mix. However, your full mix should also be provided in case it really is good, which will save mastering time in that case.
It can often be of great benefit to master from STEMS (stereo submixes), especially when one does not have confidence in the mixing environment or lacks the engineering experience or tools to perfect the mixes. In this case, the mix engineer would get the mix as perfect as possible and then, rather than recording the entire mix at once, would record individual stereo submix tracks consisting of, for example, Drums, Bass, Keyboards/Guitars, Lead Vocal, and any sweetening, such as Strings, Horns, etc. These elements should be recorded from the exact same start time so that they can be brought into a new project, moved to time zero with all faders at 0dB, and will accurately represent your mix. This approach allows much greater flexibility in fixing serious problems than does mastering a full stereo mix. However, your full mix should also be provided in case it really is good, which will save mastering time in that case.