CREATE TABLE band (id NUMBER, firstname CLOB, lastname CLOB)
CREATE TABLE vocals (songid NUMBER, bandmate NUMBER, type CLOB)
CREATE TABLE albums (aid NUMBER, title CLOB, year NUMBER, label CLOB, type CLOB)
CREATE TABLE tracklists (albumid NUMBER, position NUMBER, songid NUMBER)
CREATE TABLE performance (songid NUMBER, bandmate NUMBER, stageposition CLOB)
CREATE TABLE instruments (songid NUMBER, bandmateid NUMBER, instrument CLOB)
CREATE TABLE songs (songid NUMBER, title CLOB)

What are all the instruments used?
SELECT DISTINCT instrument FROM instruments
SELECT DISTINCT "instrument" FROM "instruments"