Before the first downbeat: agree your terms

The most valuable hour a new piano trio can spend together often happens before anyone opens a score. Sit down with a pot of tea and ask a few blunt questions. Are you a long-term ensemble or a one-off recital? How much can each of you realistically rehearse each week alongside teaching, other gigs and family life? Who books the room, who keeps the diary, and how are costs and any fees split? Try to cover the unglamorous things too: punctuality, notice for cancellations, what happens if someone is ill the week of a concert.

It also helps to name what you each want from the group. One player may be hungry for competitions; another may simply want to play Brahms with friends once a month. Neither is wrong, but unspoken differences turn into quiet resentment. A shared document with dates, repertoire and contact details sounds bureaucratic; in practice it removes a whole category of friction and lets you get on with the music.

Set rehearsal agreements that protect the playing

Agreements are not rules for their own sake — they are what allows three people to relax and work quickly. A workable set for a new trio might include:

• Phones face down and notifications off for the duration. Nothing kills a rehearsal's concentration like a message alert in the slow movement.
• Start on time, with a ten-minute warm-up that is not the hardest passage in the programme. Begin with something you already play well.
• Everyone brings a pencil and a spare score. No one should be asked to remember a decision.
• Break every forty-five to fifty minutes. Ears tire long before fingers do, and fatigue is where careless words creep in.
• Agree a signal for stopping — a raised hand rather than a shout mid-phrase. Stopping in the middle of an entry makes everyone feel auditioned.
• Try each other's ideas once before judging them. "Let's have a go and see" is far more productive than "that won't work".
• Keep a rehearsal log: bar numbers, agreed tempi, bowings, dynamics and who leads where. Ten minutes of note-taking saves an hour of re-deciding next week.

Build a shared sound rather than three good performances

Piano trios live or die on balance, because the piano is effectively an orchestra sitting beside two single lines. Sort out the physical setup early. Where does the piano lid sit — half stick or full? Can both string players see the keyboard, and can the pianist see the cellist's bow and the violinist's arm? A shallow arc with the cellist on the pianist's left and the violinist on the right works for most repertoire, but do not be afraid to move.

• In fast movements, the pianist's left hand is usually the ensemble's pulse. If the cellist and pianist agree on the bass line first, the violin line almost tunes itself.
• Strings take their A from the piano, and check it again after a long slow movement. Instruments drift, rooms are warm, and nothing undermines confidence like a drifting third.
• Agree dynamics in context, not in isolation. A marked piano in the violin part may need to be a generous one to speak over sustained piano chords.
• Test tempi at both extremes before settling. Play the passage faster than you intend, then slower, then choose. Write the metronome figure in the log so nobody has to argue from memory next time.
• Work in short chunks — two to eight bars — then immediately play the section in context. Chunks polished in isolation often refuse to fit back into the whole.

Disagree well and decide kindly

Every trio has a passage where three intelligent musicians hear three different pieces. What matters is how you talk about it. Describe the effect you want rather than criticising the playing in front of you: "I hear this as more held back" lands very differently from "you're rushing". Asking "what's your picture here?" invites a colleague to explain rather than defend.

A few practical habits help. Let whoever carries the melody lead the shaping of that phrase. Rotate who speaks first so the same voice is not always the one proposing. When you are stuck, record the passage, listen back with scores in hand, and let the recording settle the argument. If a disagreement runs past ten minutes, park it, play something else, and return at the next rehearsal — most disputes look smaller after a week. A trio is neither a democracy nor a dictatorship; it is a conversation with three people who all have to live with the result.

Keep the human side in tune

Trust is built in small courtesies as much as in bars. Arrive early enough to chat. Ask about the cellist's new strings or the violinist's shoulder rest. Notice when someone has had a difficult week and suggest an easier session. Take turns hosting, or at least vary the rehearsal venue so one person is not always travelling.

Be specific with praise: "that shift into the second subject was lovely" means more than "that was nice". And look after the relationship between rehearsals — a group message, a shared listening list, a coffee after a session. Above all, book a low-stakes performance early: a friend's living room, a lunchtime slot, anything modest. Playing to someone, together, and recovering from a slip without a flinch teaches you more about ensemble than any amount of polishing. That shared recovery, more than flawless unison, is what an audience actually hears as trust.