Electronic musical instrument with pitch alteration function

An electronic musical instrument, comprising:

• pitch designating means for permitting designation of a pitch designated by a pitch designating operation;
• pitch alteration designating means including trill designating means for designating alteration of a pitch designed by said pitch designating means to execute a trill performance;
• pitch alteration width programming means for manually programming an alternation width of a pitch to be altered by said pitch alteration designating means;
• pitch alteration width memory means for storing pitch alteration width data designated by said pitch alteration width programming means;
• and
• pitch alteration control means for, when pitch alteration is designated by said trill designating means under a condition that a predetermined pitch is designated by said pitch designating means, executing such a control that said pitch designated by said pitch designating means is altered to another corresponding pitch in accordance with said pitch alteration width data stored in said pitch alteration width memory means.