Peter Hook is confirmed to have used Rotosound RS66LD Swing Bass 45-105 strings during the Joy Division era, specifically on his Hondo Rickenbacker copy. This is evidenced in a televised performance of "She's Lost Control" on the "Something Else Show" in September 1979, where the distinct red silk ends characteristic of Rotosound strings are clearly visible on his bass. The performance was remastered and shared by Agustín Casas Solaro on YouTube.

Kim Gordon is confirmed to use Rotosound RS66LD Swing Bass 45-105 strings, as she is listed as a Rotosound artist on their website's "Players" page. This is further supported by images showing the distinctive red silk of Rotosound strings.

At 0:09 he shows the strings that he use Rotosound RS66LD Swing Bass Strings in order to record a good tone with the bass.

Entwistle was often noted for his place in helping to pioneer and develop Rotosound's bass string design & tonality quality with the help of Rotosound founder & chairman James How.

From November 1975, Guitar Player interview:

What type of strings do you use?

Rotosound. I have to use them — I designed the flaming things! Poor Greg Lake, Chris Squire [laughs]. I was looking for bass strings which vibrated properly, and I couldn’t find a good E and A string on any set at all, except maybe for LaBella — they weren’t too bad. But I wanted a round-wound string. I was approached by Rotosound, and they said they’d make some strings for me, exactly what I wanted. So I went to the factory, and they brought out a set of their round-wound and asked what I thought of them. The E and the A didn’t vibrate properly, and the D and the G weren’t heavy enough. So I sat there all afternoon while they made me strings with different cores, and different gauges, and different types of wire, and finally got through the E, A, D, G, and got a balanced set. And I said, “they’re fine, make me as many sets as you can.” They started making them and said, “look, we’ll put your picture in the string sets, and we’ll put these strings on the market.” So they issued them as “Swing Bass,” and they’ve been out ever since. A lot of people use them and get the same sound as me. I wanted to get a sound like a piano, which is why I wanted round-wound strings; I found that I could play chords and get a lot more sustain out of wire wound, so that’s really why I set out to get the strings done.

In a seperate interview Entwistle stated:

From April 1995 Bassist interview:

[Q]: How did the link [with Rotosound] evolve?

[JE]: “It was in 1966 and I was looking for that Danelectro sound again. I tried everybody’s strings but the E and the A’s just didn’t work. It was the same with Rotosound but there was something about them that was almost there but not quite. To solve the problem I got in touch with James Howe[sic] and told him his D and G strings were great but the E and A didn’t vibrate properly. He told me to take my bass along to Rotosound and have some strings made until they got it right. After a couple of hours, we realised that the problem wasn’t in the wire winding, but in the core of the string. You could see that the strings vibrated in a big circle and that was wrong; the core needed to be thicker. We also made the overall gauges a bit heavier and they sent me away with 12 sets to use. A couple of days later they called and asked if I objected to them putting my name to the strings and selling them commercially. I told them I didn’t mind as long as they kept me supplied with free strings! But then we had to do the same with medium and short scale strings because I had loads of different basses by then. Those strings, the RS 66 sets, were the first that vibrated properly other than the Danelectros.”

The "Danelectro Sound" to which Entwistle is refering is the tone made by the stock bass strings on Danelectro's short-scale basses, which weren't available for general purchase.

Used in the 80s with David Lee Roth, as stated in the Rotosound website, Billy Sheehan has been a long time Rotosound player and endorser

In this photo Steele can be seen with a pack of Rotosounds taped to his Alembic Spoiler bass.

Jeff Ament, the bassist for Pearl Jam, is known to use Rotosound RS66LD Swing Bass 45-105 strings on his Mike Lull basses. This is evidenced by the distinctive red silk string ends and the UK-colored ball ends at the bridge, which are characteristic of Rotosound strings. Furthermore, Pearl Jam is listed as a Rotosound artist on the official Rotosound website.

On Rotosound's official website, they list the RS66LD Swing Bass strings as the strings Chris Squire used throughout his career. They noted "Sometimes we will make up Chris’s custom extra long scale Swing Bass strings!"

In a January 1979 issue of Guitar Player magazine Gene was asked, “What kind of strings do you use?”

Gene answered, “I use Rotosound Roundwound Extra Long strings because they’re more metallic. They wear down the frets and your bass needs a fret job done every four or five months, but the Rotosound Roundwounds have that metallic edge, and no matter how low you go you can still hear the twang—especially if you push the mids and the highs, you’re going to get a buzzsaw effect without a fuzz box.”

Adam Clayton used Rotosound RS66LD Swing Bass 45-105 strings in the 1980s and 1990s as evidenced by an ad from 1991 from Rotosound showing what strings U2 used. Additionally, he is listed as a Rotosound Artist on the brand's website, alongside his bandmate The Edge.

Andy Bell used Rotosound RS66LD Swing Bass 45-105 strings on his basses with Oasis, as evidenced by the distinct red silk at both string ends, a characteristic feature of Rotosound strings at the time.

In a 2007 interview on FretlessBass.com, Steve DiGiorgio stated that he used Rotosound strings, specifically mentioning that on his four string basses and his five-string basses he added a high C, resulting in a gauge of 35 to 105. This is corroborated by photos and live performances dating back to the Death era, where the distinctive red silk at both ends of his bass strings is visible, confirming the use of Rotosound RS66LD Swing Bass 45-105 strings.