Kids living with grandparents on an old space ship that doesn't need to launch from a cradle

Question

Children's sci fi novel:

space ship did not need to be launched from a cradle unlike the newer ships.
children disappearing on school trip to uninhabited planet.
Standing stones activated by music.
It was a trading spaceship think the kids lived with grandparents and it was a really old ship

Otis · Answer

Per the comment by the OP above, this is Dragonfall Five and the Empty Planet (1973) by Brian Earnshaw.
Per the plot summary on the Wikipedia article about the series:

Tim and his brother Sanchez have to attend school on the Empty Planet,
a place of musical rocks, whispering trees, from which the last
inhabitants vanished without a trace.

Kids living with grandparents on an old space ship that doesn't need to launch from a cradle

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