Simplify the following text for a Grade 10 native English-speaking person.
Original: SÃ rusier 's ideas regarding the coherence between music and painting gave rise to her theory of vibrism , which is a middle course between the Synthetic Cubism of the pre-war period and Larionov and Goncharova 's Rayonism .
Simplified: SÃ rusier 's had ideas about the relationship of music and painting . She used these ideas to form the theory of vibrism , which is a combination of Synthetic Cubism of the pre-war period and Larionov and Goncharova 's Rayonism .