The boards went down just as I tried to post this reply last night. Luckily, I saved a copy before hitting submit. Here it is, 24 hours late:
[QUOTE=SSG Schwartz]
I was thinking that at some point, the drummer could have to redo his piece. Is it really possible to lay down the drum track without any other tracks, no bass, no guitar, etc?
[/quote]
Sure, as long as the track layout was handled properly. In modern music, electrical instruments (electric bass, all-electric guitars, electric keyboards) are piped directly into the recording console and recorded on one or more[sup]*[/sup] of their own tracks with minimal leakage. (This is harder with acoustic instruments because they rely on mics.)
So as long as each track is sufficiently independent, any one can be replaced by a new recording. Or, if enough tracks are available, a new track can be laid down, the old one retained, and either, both or none can be used in the final mixdown.
But because the drums are the timekeepers, a drummer overdubbing a new track would have to be very precise and try to match his tempo to the other instruments (or even another drum track).
Even if all instruments are acoustic, the recording engineer tries to separate them as much as possible so the guitar’s mic(s) don’t pick up much of the drums and vice-versa. “Gobos” (so named because they go between instruments) are placed to minimize leakage; isolation booths are used (typically for drums) and other acoustic tricks can be called upon. Musicians like be close to each other when playing, but a recording engineer would prefer they were in different cities, so there’s some compromise here.
I was once called upon to assist in replacing the sax and flute parts for a recording that had been considered completed, ready for final mix and release. It was a Blood, Sweat & Tears kind of band, and the sax/flute player refused to sign with the record company, so the company rerecorded everything he played, copying every nuance possible, with another (very good) player. My task was to write down everything the sax player had done, including solos, to help the substitute player.
The record was released and the attorneys were happy. Too bad it didn’t sell many copies.
- Many instruments are recorded on two or more tracks to provide a stereo image or at least pretend to have one, even if you might call them basically monophonic. Drums may be recorded on 5 to 10 tracks to provide much flexibility in mixdown.