This music blog post discusses four instruments - the flute, electric guitar, piano, and violin. It provides basic details about each instrument such as who invented it, how it produces sound, key facts like the number of keys on a piano. The flute produces sound from the flow of air across an opening and was invented by John Macintosh. The electric guitar was invented by Les Paul in 1950 and was a key instrument in 1940s music. The piano was invented in the late 1700s by Bartolommeo Cristofori and can have over 10 types. The violin originated in northern Italy in the 16th century and the best was carved during the Renaissance by Gasparo de Saló.