Always remember that your audio engineer does not perform magic. His or her talents are only useful in making your recording sound professional and pleasing, but making the song soulful and organic is up to the artist. Here are three things you should always practice before hitting the studio.
Musical documentation is not always sheet music; it could just be a notebook with lyrics, chords or tablature of your group or solo songs. This documentation will be useful especially if someone forgets parts in songs. Most vocalists also forget some of their lyrics and musicians some of their passages, especially complicated ones, despite consistent practice.
Your instrument is crucial to bringing the song to life. Vocalists should avoid stressing their vocal chords and they must talk sparingly a day or two before the recording date. Musicians must check their instruments to avoid broken strings or instrument malfunction during the recording.
Having the right documentation in hand helps prepare musicians to play their music during recording, but some of the more “organic” passages rely heavily on practice. Look at every minute detail and some errors in the passages you play and try to improve them before the recording date.