[Java] non-static variable this cannot be referenced from a static context

[cmboni]

Ciao!
Ecco l'erorre che mi da:

Test2.java:16: non-static variable this cannot be referenced from a static context
                        Multi t1 = new Multi("Fondamentale",80,rcv);
                                   ^
Test2.java:17: non-static variable this cannot be referenced from a static context
                        Multi t2 = new Multi("Terza",84,rcv);
                                   ^
Test2.java:18: non-static variable this cannot be referenced from a static context
                        Multi t3 = new Multi("Quinta",87,rcv);
                                   ^
3 errors

Su questo codice:

import javax.sound.midi.*;


public class Test2 {

 
	   public static void main (String args[]){
		System.out.println("Ciao Mondo, questo è il mio programma Java");
		
		try {
			Synthesizer syn = MidiSystem.getSynthesizer();
			if (!syn.isOpen()) syn.open();
			Receiver rcv = syn.getReceiver();
		
				
			Multi t1 = new Multi("Fondamentale",80,rcv);
			Multi t2 = new Multi("Terza",84,rcv);
			Multi t3 = new Multi("Quinta",87,rcv);
		
			t1.start();
			t2.start();
			t3.start();
		
		
			Thread.sleep(1000);
			rcv.close();
			
		} catch (Exception e) {}
	 }



	class Multi extends Thread {
		private String name;
		private int note;
		private Receiver rcv;
		
	  public Multi(String s, int n, Receiver rcv){
		this.name = s;
		this.note = n;
		this.rcv = rcv;
	  }
	  
	  public void run() {
		play(this.rcv,note);
		System.out.println(name); 
	  }

	}
	
	
	 public void play (Receiver r, int n) {
		try {
			int timeStamp = -1;
			ShortMessage dn = new ShortMessage();
			ShortMessage up = new ShortMessage();
			dn.setMessage(ShortMessage.NOTE_ON,0,n,127);
			up.setMessage(ShortMessage.NOTE_OFF,0,n,127);
			r.send(dn,timeStamp);
			Thread.sleep(1000);
			r.send(up,timeStamp);
		} catch(Exception e ){
				System.out.println(e);
		  }
	 }
	 



}

le linee in errore sono queste:

Multi t1 = new Multi("Fondamentale",80,rcv);
Multi t2 = new Multi("Terza",84,rcv);
Multi t3 = new Multi("Quinta",87,rcv);

Non capisco cosa ci sia di sbagliato, ma sono alle prime armi, per cui...

Grazie anticipatamente.