Aqueous compositions useful as pretreatments prior to painting and to reduce the formation of rust in the uncoated condition consist essentially of water, an organo-functional silane, a compound of a Group IV-B element, and optionally a polyvinyl alcohol, stabilizing agents, wetting agents, thickeners, and biocides, and have an alkaline pH>7. The prediction model is derived using multiple regression analysis on the pre-operative and post operative data. The method can provide field emission cathode plate achieving uniform field emission and does not involve high resolution and cost. A microprocessor unit receives musical score data with a plurality of standard musical notes and at least one recognized musical note and compares the recognized musical note with the plurality of standard musical notes to find a corresponding position for the recognized musical note in the music score data, wherein the music score data is capable of segmentation into at least one page. The lens is readily adjusted relative to the image sensor by rotating the lens support.