Jupyter notebook crashing frequently

[at...@snu.edu.in]

I am working on the problem of audio classification. For this purpose, I am following an online tutorial to extract features from the urban sound dataset here. Urban sound classification. I have downloaded the complete dataset from: Urban sound dataset.
Everything goes well till I try to plot the waves using the function:

   plot_waves(sound_names,sub_raw)

I get this error message:

 
I thought that the data being fed is too large for the jupyter notebook to handle. So, I decreased the data size but I am unable to figure out my mistake.