Ben Ich Hai explains that reading the tehilimes is a very important way to weaken the yetser ara. 

The yetser ara is called nah'ach (snake) 

If we take the previous letters of the Nah'ach word, we get the word zemer (which means to uproot or sing[tehilim]): 

Noun - previous letter - Mem

H'et and - previous letter - Zain

Chine - previous letter - Rech 

Translated with www.DeepL.com/Translator (free version)