Sounders.

[Toffee.]

[spoiler=Monster]
Dance Sounder
EARTH / Level 4
[Thunder/Effect]
When this card is Normal Summoned: You can Special Summon 1 "Dance Sounder"(from your Hand). During the Damage Step of either Player's turn, in which this card battles an Opponent's monster, you can Banish 1 other "Dance Sounder" you control: Double this card's original ATK until the End Phase
ATK / 1300 DEF / 500

Groove Sounder
EARTH / Level 4
[Thunder/Effect]
When this card is Normal Summoned: You can Special Summon 1 "Groove Sounder"(from your Hand). During the End Phase of a turn in which 2 or more "Groove Sounder"s you control were all destroyed(either by Battle or card effect) by your Opponent's card(s), you can Target 2 "Sounder" monsters in your Graveyard with the same name, except "Groove Sounder": Return the Targets to your Hand. Then, Banish all "Groove Sounder"(s) in your Graveyard. You can only activate this effect of "Groove Sounder" once per turn.
ATK / 1800 DEF / 1400

Beat Sounder
EARTH / Level 4
[Thunder/Effect]
When this card is Normal Summoned: You can Special Summon 1 "Beat Sounder"(from your Hand). During the End Phase of a turn in which 2 or more "Beat Sounder"s you control were all destroyed(either by Battle or card effect) by your Opponent's card(s): Add to your Hand 2 "Sounder" monsters with the same name, from your Deck. Then, Banish all "Beat Sounder"(s) in your Graveyard. You can only activate this effect of "Groove Beat" once per turn.
ATK / 1500 DEF / 1000

Bass Sounder
EARTH / Level 4
[Thunder/Effect]
When this card is Normal Summoned: You can Special Summon 1 "Bass Sounder"(from your Hand). You can Banish This card and 1 other "Bass Sounder" you control, to Target 1 card on the field: Banish the Target.
ATK / 1200 DEF / 1600

Wave Sounder
EARTH / Level 4
[Thunder/Effect]
When this card is Normal Summoned: You can Special Summon 1 "Wave Sounder"(from your Hand). You can Banish this card and 1 other "Wave Sounder" you control, to Target 2 of your Banished "Sounder" monsters, except "Wave Sounder": Special Summon the Targets.
ATK / 500 DEF / 2000

Rock Sounder
EARTH / Level 5
[Thunder/Effect]
When this card is Tribute Summoned by Tributing a "Sounder" monster: You can Special Summon 1 "Rock Sounder"(from your Hand). If this card is Special Summoned by the effect of "Rock Sounder": Special Summon 2 Level 4 "Sounder" monsters with the same name, from your Deck. This effect of "Rock Sounder" can only be activated once per turn. You cannot Special Summon non-"Sounder" monsters the turn you activate this effect.
ATK / 1700 DEF / 1800[/spoiler]
[spoiler=Extra Deck]
Number 13: Mic Sounder
EARTH / Rank 4
[Thunder/Xyz/Effect]
4 Level 4 "Sounder" monsters.
Once per turn you can Detach 2 Xyz Materials with the same name from this card: Activate 1 of these:
•Draw 1 card.
•Target 1 face-up monster on the field: Target monster's effect is negated, and you can change it's Battle Position.
•Increase the ATK of this card by 800 until the End Phase.
ATK / 2200 DEF / 2000

Number C13: Double-V Sounder
EARTH / Rank 5
[Thunder/Xyz/Effect]
4 Level 5 Thunder-Type monsters.
When this card is Xyz Summoned: Draw 1 card. If "Number 13: Mic Sounder" is an Xyz Material for this card, This card gains the following effect:
•Once per turn, you can Detach 1 Xyz Material from this card: Change all other monsters on the field to Face-up Attack Position and negate their effects. Then, this card gains 500 ATK for each monster who's effect was negated in this card. These effects last until your Opponent's next End Phase.
ATK / 2300 DEF / 2000[/spoiler]
[spoiler=Spell]
Sounder Force
Spell
Discard 1 Spell card: Add to your hand 2 Level 4 "Sounder" monsters with the same name from your Deck.

Sounder Performance
Spell
Target 2 "Sounder" monsters you control with the same name: Double the original ATK of the selected monsters. Only the Target monsters can declare an attack this turn, and they cannot declare a direct attack. During the End Phase of a turn in which you activated this effect: Banish the Target monsters. You cannot Special Summon from your Extra Deck, the turn you activate this effect.

Sounder Drive
Spell
Discard 2 Spell cards. Target 4 of your Banished "Sounder" monsters, and Special Summon them. Immediately after this card resolves, Xyz Summon 1 "Sounder" Xyz Monster using those 4 monsters only.

Sounder Core
Spell / Quick-Play
Banish 2 "Sounder" monsters you control with the same name: Draw 3 cards.[/spoiler]