|Appears in||Mother 3|
|Vulnerable to||PK Fire|
|Location||Club Titiboo Attic|
|In-battle theme||Rock and Roll (Spicy)|
- "A wooden bass whose time in the limelight is up. Holds a grudge against the new bass on the block."
- — Battle Memory
- "As you can plainly see, I am a wooden bass. I'm still in my prime. But ever since the bass below showed up, I've been left to rot in this moldy-smelling attic. I'm filled with so much frustration. I'm gonna turn this frustration into violence and take my stress out on you guys! You're gonna be bawlin' your eyes out!"
- — Jealous Bass
The Jealous Bass is a boss in Mother 3. Like its name implies, it is a jealous old bass that was once used by Lucky in the DCMC, and when Lucky started using a new bass, the Jealous Bass was put up in Club Titiboo's Attic despite the fact that the Jealous Bass was still usable. Due to its frustration, the Jealous Bass attacks Lucas and Boney with a Beaten Drum and a Gently Weeping Guitar. The Jealous Bass is capable of using Hypnosis α. His attacks also include a (solo) jam session (the instruments do a consecutive attack with each instrument attacking once, except for the Jealous Bass, which attacks twice) and a regular attack. If Lucas defeats its other party members in the fight before the Jealous Bass, it will fly into a rage, causing its Offense to rise. The Jealous Bass is perhaps a strange creature according to Boney. When the Jealous Bass is defeated, Lucas and Boney can escape the Attic by jumping through the air duct into Lucky's room.