Anna Green and Hannah Middleton are post-graduate students from the Institute for Gravitational Wave Astronomy at the University of Birmingham. Gravitational waves are ripples in space and by observing them, they can be used for astronomy to learn about the universe. They were seen for the first time in 2015 when a gravitational wave signal from the collision of two black holes black holes was picked up. Anna is working on instrumentation for the gravitational wave observatories and Hannah on data analysis for gravitational wave signals. With Leon Trimble, they have been exploring the analogy of sound and vibrations with gravitational wave ripples.