on 1968, which musical artist stopped being active?
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New Vaudeville Band James Brown & The Famous Flames Quarteto Novo The McGuire Sisters Dirty Blues Band Every Mother's Son Butch Engle & The Styx Les Fleurs de Pavot Charles River Valley Boys The Rock & Roll Dubble Bubble Trading Card Co. of Philadelphia - 19141 Clear Light The Rascals Terry Knight & The Pack Geno Washington & The Ram Jam Band The Jordans The Astronauts The Shangri-Las The Art of Lovin' The Mindbenders Quartette Trés Bien Touch Jormas Hour Glass The Yardbirds The James Taylor Move The Cake The Six Teens Circus Maximus The Holy Mackerel null The Sonics The Outsiders Gandalf The Dirty Mac Beauregard Ajax The Barbarians Los Darts Autosalvage The Outcasts The United States of America Uriel Alton Ellis & the Flames The Cleves Young-Holt Unlimited Band of Joy The Uglys The Counts IV The Freedom Sounds Phil & The Frantics Twice as Much Python Lee Jackson John's Children Tony Rivers & The Castaways Los Bravos Tages Alan Price Set The Trade Winds The Soulmen The Hi-Fi's Dunn and McCashen The Toys Los Stop Wim Sonneveld & Leen Jongewaard Listening Blues Section The Paris Sisters The Beau Marks Chamaeleon Church Thee Deuces The Creation The Ant Trip Ceremony Lea Riders Group Liverpool Five Los Speakers Les Gypsys The Morning Glories The Hesitations Stone Poneys Loubogg Tintern Abbey The Stillroven Bell Telephone Hour Orchestra The Hounds The Balloon Farm Quintin E. Klopjaeger & The Gonks Light Afterglow The Zoo The Flies The Family Tree King Bruce and the Black Beats Plums All Night Workers The New Tweedy Bros The Rose Garden The Act Le Stelle Di Mario Schifano Los Sleepers The Tickle The Humane Society Piccadilly Line Fabulous Four The Hunters The Four O'Clock Balloon The Shakers No Names Limey & the Yanks The Camaros Boz Danny King and The Mayfair Set The Henchmen
class literal
music.artist 1968^^http://www.w3.org/2001/XMLSchema#gYear
music.artist type.datetime
Musical Artist 1968
none none
music.artist.active_end
Active as Musical Artist (end)
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :music.artist . 
VALUES ?x1 { "1968-08:00"^^<http://www.w3.org/2001/XMLSchema#gYear> } 
?x0 :music.artist.active_end ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND music.artist (JOIN music.artist.active_end 1968^^http://www.w3.org/2001/XMLSchema#gYear))