The piano and the violin were both ranked favorably by girls, more than boys, while boys prefer the drum and trumpets. There was broad agreement between boys and girls on which instruments each sex should play and the reasons vary. And while almost half of all boys said they avoid certain instruments because they were too difficult to play, only about 15% of girls gave that as a reason. Earlier studies indicated that very young school children aged between five and seven showed no bias in choosing musical instruments, but their tastes become more clear between the ages of eight and ten. One survey of 78 teachers suggested that after that age both boys and girls begin to restrict themselves to the so-called male or female instruments.