I've been a pro musician, all my life and I've been in a number of different bands so I'm qualified to answer.
How do pros practice or rehearse? On stage! If you can't rehearse on stage, where
CAN you practice or rehearse?
Actually practicing and rehearsing are two entirely different things.
Practice you do by yourself, rehearse you do with the band.Practice is learning the material. I don't necessarily play the song through from end to end at first. That's crazy unless you can play the song end-to-end already.
Different people learn different ways.
First I warm up a bit. Then I go through the song I'm learning until I hit a rough spot. If I have difficulty fingering a passage, I'll play it as fast as I can WITHOUT MAKING A MISTAKE for 2 minutes. Not making a mistake is most important as yu don't want to get the mistake under your fingers. Then I take my hands off my instrument and do something completely different for 2 minutes, not musical. Then I repeat play for 2 minutes, rest for two minutes. I find I learn passages faster this way than if I keep hammering at them continuously.
Then I start at the beginning until I either get to the next rough spot or the end.
If I have the luxury of having sheet music, I can sightread pretty much anything except those difficult parts I have to do the 2 minute routine on. But if I have the sheet music, I'll look through it and count out any tricky rhythms before I pick up my instrument. That way I'll be ready while reading.
For me practice is learning new songs, or new skills on the instrument.
Years ago practice also meant memorizing scales, arpeggios (on sax) and chords (on guitar). Now I have different skills to learn, and that depends on what new learning adventure I find myself on.
Rehearsal is something completely different. In a truly professional band, every player has already practiced and learned their parts. Each can play the songs from beginning to end at the desired tempo. Rehearsal is coordinating the playing of the band members, listening to the other members, melding with the other members, so that the song is played as a cohesive unit, not individual musicians.
In rehearsal the band mates can bounce ideas around, modify the arrangement, and improve the song or personalize it to the band's unique sound.
Anyone who confuses practice with rehearsal, needs to learn the difference.
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