Thank you guys.
1: Eugene
2: Naveen
3: The Prince
4: Prince Phillip
5: Prince Charming
6: John Smith
7: Aladdin
8: Shang
9: Adam/The Beast

1. Prince
2. Phillip
3. Flynn
4. Charming
5. John Smith
6. Shang
7. Aladdin
8. Beast
9. Naveen

1. Beast
2. Shang
3. John Smith
4. Aladdin
5. Naveen
6. Prince
7. Charming
8. Phillip
9. Flynn

1. john smith
2. shang
3. aladdin
4. flynn
5. the beast
6. naveen
7. phillip
8. charming
9. the prince

1. Prince
2. Philip
3. Flynn
4. Naveen
5. Shang
6. Aladdin
7. Charming
8. John
9. Beast

9. Aladdin
8. Charming
7. Flynn
6. Prince
5. Beast
4. Phillip
3. Naveen
2. John Smith
1. Shang

1. Phillip
2. Shang
3. Charming
4. Aladdin
5. Flynn
6. Prince
7. Beast
8. Naveen
9. John Smith

1. Shang
2. Aladdin
3. Phillip
4. Beast
5. Prince
6. Charming
7. Naveen
8. Flynn
9. John Smith

1.Adam/Beast
2.Naveen
3.Prince Charming
4.John Smith
5. Shang
6.Phillip
7.Aladdin
8.Flynn
9.Eric

Eric has not sung in the first movie and I am not sure if the singing in the second is his original voice so he is out of the list. As for the others:
1. Naveen
2.John Smith
3. Shang
4.Philip
5.Flynn
6.Prince Charming
7.Prince
8.Aladdin
9.Adam

1. Shang
2. Flynn
3. Aladdin
4. John Smith
5. Naveen
6. Phillip
7. Adam
8. Prince
9. Charming

1. Shang
2. Aladdin
3. Eugene
4. Phillip
5. John Smith
6. Charming
7. Prince
8. Naveen
9. Adam/Beast

1.Aladdin
2.The Prince
3.Eugene
4.Shang
5.Phillip
6.Beast
7.Naveen
8.Prince Charming
9.John Smith

1. Shang
2. Eugene
3. Aladdin
4. Philip
5. Naveen
6. Beast/Adam
7. Prince
8. Charming
9. John Smith

1. Flynn
2. Aladdin
3. Shang
4. Phillip
5. Beast
6. Charming
7. John Smith
8. Prince
9. Naveen

1. Aladdin
2. John Smith
3. Shang
4. Phillip
5. Naveen
6. Prince
8. Beast
9. Charming

1. Flynn
2. Shang
3. Aladdin
4. Prince
5. John Smith
6. Beast
7. Phillip
8. Charming
9. Naveen