Compared to previous Beach Boys albums, "Pet Sounds" contains fewer vocal harmonies, but the types of vocal harmonies themselves are more complex and varied. Instead of simple "oo" harmonies, the band showed an increasing engagement in multiple vocal counterpoints. There is also a greater occurrence of doo-wop style nonsense syllables, appearing more times than in any previous album. Wilson invokes his signature falsetto seven times on the album. With the exception of "Today!", this was the most he had on a Beach Boys album since 1963's "Surfer Girl".