Granite may have more alkali feldspar, whereas a granite derived from partial melting of metaigneous rocks may be richer in plagioclase. It is on this basis that the modern "alphabet" classification schemes are based. The letter-based Chappell & White classification system was proposed initially to divide granites into I-type (igneous source) granite and S-type (sedimentary sources). Both types are produced by partial melting of crustal rocks, either metaigneous rocks or metasedimentary rocks. M-type granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from the mantle. However, this proposal has been rejected by
This Is What Rock n' Roll Looks Like at number forty-four on the US "Billboard" Hot Dance Club Songs. A music video for "This Is What Rock n' Roll Looks Like", shot and directed by Sanaa Hamri, was released on March 27, 2011. The music video pays homage to Porcelain Black's high school experiences, where she was constantly teased by "snobby rich kids", but never gave in to the pressure of her peers around her. The video serves as a form of revenge for Porcelain Black against high school tormentors. "This Is What Rock n' Roll Looks Like" garnered mixed reviews from critics, most of whom were shocked