Bassists often play a bass line composed by an arranger, songwriter or composer of a song—or, in the case of a cover song, the bass line from the original. In other bands—e.g., jazz-rock bands that play from lead sheets and country bands using the Nashville number system—bassists are expected to improvise or prepare their own part to fit the song's chord progression and rhythmic style.
In the 1930s, musician and inventor Paul Tutmarc of Seattle, Washington, developed the first electric string bass in its modern form, a fretted instrument designed to be played horizontally. The 1935 sales catalog for Tutmarc's electronic musical instrument company, Audiovox, featured his "Model 736 Bass Fiddle", a four-stringed, solid-bodied, fretted electric bass instrument with a 30 1⁄2-inch (775-millimetre) scale length. The adoption of a guitar's body shape made the instrument easier to hold and transport than any of the existing stringed bass instruments. The addition of frets enabled bassists to play in tune more easily than on fretless acoustic or electric upright basses. Around 100 of these instruments were made during this period.
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