Question: Are Gregg Rolie and Joe Gittleman both bassists?

Context articles: Gregg Rolie
No One to Depend On
José Areas
Welcome (Santana album)
Joe Gittleman
Departure Tour
The Mighty Mighty Bosstones
I Wanna Go Back
Avoid One Thing
Caravanserai (album)

Gregg Alan Rolie (born June 17, 1947, Seattle, Washington, United States) is an American singer and keyboardist.
 Rolie served as lead singer of the bands Santana, Journey and Abraxas Pool – all of which he co-founded.
 He also helmed rock group The Storm, and currently performs with his Gregg Rolie Band.
 Rolie is a two-time inductee of the Rock and Roll Hall of Fame, having been inducted both as a member of Santana in 1998 and as a member of Journey in 2017.
"No One to Depend On" is a song by Latin rock band Santana, from their 1971 album, "Santana III".
 It is the second track on the first side of the LP album and was released as its second single.
 It was written by Mike Carabello, Coke Escovedo, and Gregg Rolie.
José Octavio "Chepito" Areas (born 25 July 1946) is a Nicaraguan percussionist best known for having played timbales in the Latin rock group Santana from 1969-1977 and 1987-1989.
 In 1998, he was inducted into the Rock & Roll Hall of Fame for his work in Santana.
 In 1997, he performed on "Abraxas Pool" with other members of the early 1970s iteration of Santana, including Gregg Rolie, Neal Schon, Michael Carabello and Michael Shrieve.
 Previously, he released an eponymous solo album on Columbia/CBS Records in 1974.
 "La Gigantona", a 1976 collaboration with Nicaraguan singer-songwriter and childhood friend Alfonso Noel Lovo, was reissued by Numero Group in 2012.
 Featured along with Richard Bean in "The Sounds of Santana" CD by Mike Roman & The Tellstars (2003).
 Featured along with Michael Shrieve in "Cha Cha Time!"
 CD by Mike Roman & The Tellstars (2007).
Welcome is the fifth studio album by Santana, released in 1973.
 It followed the jazz-fusion formula that the preceding "Caravanserai" had inaugurated, but with an expanded and different lineup this time.
 Gregg Rolie had left the band along with Neal Schon to form Journey, and they were replaced by Tom Coster, Richard Kermode and Leon Thomas, along with guest John McLaughlin, who had collaborated with Carlos Santana on "Love Devotion Surrender".
 "Welcome" also featured John Coltrane's widow, Alice, as a pianist on the album's opening track, "Going Home" and Flora Purim (the wife of Airto Moreira) on vocals.
 This album was far more experimental than the first four albums, and "Welcome" did not produce any hit singles.
Joe Gittleman (born April 6, 1968 in Cambridge, Massachusetts) is an American musician, best known as the bass guitar player for The Mighty Mighty Bosstones.
 His proficiency on bass earned him the nickname "the Bass Fiddleman."
The Departure Tour was a concert tour by the American rock band Journey.
 The tour was in support of their 1980 album "Departure" which was their first Top 10 album on the "Billboard" 200 that peaked at #8 and like their previous two albums, "Infinity" and "Evolution".
 This was also the last Journey tour to feature founding member of the band Gregg Rolie who left the band to start a family.
The Mighty Mighty Bosstones (stylized as The Mighty Mighty BossToneS; informally referred to as The Bosstones) are an American ska punk band from Boston, Massachusetts, formed in 1983.
 Since the band's inception, lead vocalist Dicky Barrett, bassist Joe Gittleman, tenor saxophonist Tim "Johnny Vegas" Burton and dancer ("Bosstone") Ben Carr have remained constant members.
 The line-up also includes drummer Joe Sirois, saxophonist Leon Silva, guitarist Lawrence Katz and trombonist Chris Rhodes.
"I Wanna Go Back" is a 1984 song by American rock band Billy Satellite, written by band members Monty Byrom, Danny Chauncey, and Ira Walker, that achieved major popularity when recorded by Eddie Money in 1986.
 Another version was recorded by former Santana/Journey keyboardist/singer Gregg Rolie for his self-titled 1985 debut solo album.
Avoid One Thing was started as a side project by The Mighty Mighty Bosstones' bassist Joe Gittleman.
 The Boston-based group's first album, titled "Avoid One Thing", was released in 2002 on Side One Dummy Records.
 The album was written and recorded almost solely by Gittleman.
 Gittleman assembled a band with which to tour and play his music.
 Before the release of the band's next album in 2004, the band went through several lineup changes.
 John Lynch joined the band after Dave Karcich's death due to a sudden brain aneurysm.
 Later, Delano left and the band continued as a three-piece.
 The trio returned to the studio and released "Chopstick Bridge" on May 4, 2004.
 The album reflected the combined efforts of all three band members and sounds vastly different from their first in many respects; Amy Griffin and Gittleman even split lead vocals on a few tracks.
 After the release of this album, the band toured until February 2005 before going on hiatus.
 Since that time, Griffin has been playing guitar for Darkbuster and Gittleman has moved to Los Angeles and is once again a member of the reunited Bosstones.
 Paul Delano underwent emergency surgery in 2006 and a series of benefit shows were held.
 John Lynch has since joined up with David Minehan and is now playing drums for The Neighborhoods.
Caravanserai is the fourth studio album by Santana, released on October 11, 1972.
 It marked a major turning point in Carlos Santana's career as it was a sharp departure from his critically acclaimed first three albums.
 Original bass guitarist David Brown left the group in 1971 and was replaced by Doug Rauch and Tom Rutley, while original percussionist Michael Carabello left and was replaced by Armando Peraza.
 Keyboardist/vocalist Gregg Rolie, who was having a falling-out with Santana, was replaced by Tom Coster on a few songs.
 "Caravanserai" reached number eight in the "Billboard" 200 chart and number six in the R&B Albums chart in 1972.