In this video at 13:50, John Petrucci presents his Music Man Silhouette Bass, which is set up like a baritone guitar and was used during the recording of Dream Theater's album 'Six Degrees of Inner Turbulence' for one song.

In this Instagram reel of Jason Newsted making a guest appearance at a Sepultura show, he can be seen playing a 6-string Music Man Silhouette Bass.

"This is a six-string bass. It's like a small scale bass. This is an Ernie Ball. This here is used on the song 'Back on the Saddle' and Joe originally wrote it on a Fender, but that guitar was stolen many, many years ago. This is what we have to replace. It's amazing. It's got lots of growl and it's got a Floyd Rose on it. The tuning on this one is G, it's one whole step down - standard tuning one whole step down. It's very growly. He actually plays lead on it, which is pretty amazing to watch him go crazy all over this thing. The gauge strings are .045 to .105. You got to hear him just bend it. It's pretty amazing," says Joe Perry's guitar tech.

In an eBay auction listed on the official Smashing Pumpkins account from October 19 to October 29, 2011, a "1996 Ernie Ball Music Man Baritone Bass Guitar" was sold for $1700. The listing confirmed that this instrument was used by D'arcy Wretzky on the 1998 Adore outtake "Waiting". The auction included a hardshell case, noted minor scratches on the back, and provided the serial number #97705, indicating it was manufactured on May 1, 1996. Additionally, a certificate of authenticity signed by Billy Corgan accompanied the sale.

Used for songs like Hunting Season, Trigger and The Innocent

here’s a lil post for the tonefreakz out there. #tbt to my bass #battlestation for morbid stuff - p-bass, nash pb63 (w flats), gib victory bass, EB Silhouette Bass VI, JMJ mustang, orange AD200, traynor monobloc, empress compressor and a bunch of big muffs (SECOND PICTURE OF THE SOURCE LINK)