The roster later included British jazz and folk. Some of the more progressive jazz musicians of the late 1960s were released under the Deram imprint, including Mike Gibbs, John Surman, and Mike Westbrook. Deram albums bore a DML prefix for mono and an SML prefix for stereo releases. As with other UK Decca subsidiary labels, Deram's U.S. counterpart was distributed under London Records. Decca positioned it against Island Records, Harvest Records (started by EMI), and Vertigo Records (started by Philips Records), but it failed to compete. An 'extra' progressive series with SDL prefixes did not improve the situation.