According some guy on reddit that decrypted BGMs for Smash Bros for 3DS in recent 1.0.6 update http://www.reddit.com/r/smashbros/comments/32nymz/smash_update_106_decrypted_first_observations/
Interesting enough appears BGMs for Ryu from SF2? and Fire Emblem's Roy
snd_bgm_F27_AIR_MoriStage_3DS.nus3bank
snd_bgm_H12_BW_Sentou_Zekrom_Reshiram_3DS.nus3bank
snd_bgm_SF01_SF2_Ryu_3DS.nus3bank
snd_bgm_T09_SDX_PupupuLand_3DS.nus3bank
snd_bgm_V01_PAC_PacMan_3DS.nus3bank
snd_bgm_Z80_F_Mewtwo_3DS.nus3bank
snd_bgm_Z81_F_Ryu_3DS.nus3bank
snd_bgm_Z82_F_Lucas_3DS.nus3bank
snd_bgm_Z83_F_Roy_3DS.nus3bank
Interesting enough appears BGMs for Ryu from SF2? and Fire Emblem's Roy