Answer the question at the end by quoting:

"Hey Jude" is a song by the English rock band the Beatles, written by Paul McCartney and credited to Lennon-McCartney. The ballad evolved from "Hey Jules", a song McCartney wrote to comfort John Lennon's son, Julian, during his parents' divorce. "Hey Jude" begins with a verse-bridge structure incorporating McCartney's vocal performance and piano accompaniment; further instrumentation is added as the song progresses. After the fourth verse, the song shifts to a fade-out coda that lasts for more than four minutes. "
Having earmarked the song for release as a single, the Beatles recorded "Hey Jude" during the sessions for their self-titled double album, commonly known as "the White Album". The sessions were marked by an element of discord within the group for the first time, partly as a result of Ono's constant presence at Lennon's side, and also reflective of the four band members' divergence following their communal trip to Rishikesh in the spring of 1968 to study Transcendental Meditation. Author Peter Doggett describes the completed version of "Hey Jude" as a song that "glowed with optimism after a summer that had burned with anxiety and rage within the group". The Beatles first taped 25 takes of the song at EMI's Abbey Road Studios in London over two nights, 29 and 30 July 1968, with George Martin as their producer. These dates served as rehearsals, however, since they planned to record the master track at Trident Studios to utilise their eight-track recording machine (Abbey Road was still limited to four-tracks). A take from 29 July, which author and critic Kenneth Womack describes as a "jovial" session, was issued on the Anthology 3 compilation in 1996. The 30 July rehearsals were filmed for a short documentary titled Music! However, the film shows only three of the Beatles performing "Hey Jude", as George Harrison remained in the studio control room, with Martin and EMI recording engineer Ken Scott. Author Simon Leng views this as indicative of how Harrison was increasingly allowed little room to develop ideas on McCartney compositions, whereas he was free to create empathetic guitar parts for Lennon's songs of the period. During the rehearsals that day, Harrison and McCartney had a heated disagreement over the lead guitar part for the song. Harrison's idea was to play a guitar phrase as a response to each line of the vocal, which did not fit with McCartney's conception of the song's arrangement, and he vetoed it. In a 1994 interview, McCartney said, "looking back on it, I think, Okay. Well, it was bossy, but it was ballsy of me, because I could have bowed to the pressure." Ron Richards, a record producer who worked for Martin at both Parlophone and AIR Studios, said McCartney was "oblivious to anyone else's feelings in the studio", and that he was driven to making the best possible record, at almost any cost.

Was there any scandals?

During the rehearsals that day, Harrison and McCartney had a heated disagreement over the lead guitar part for the song.

Answer the question at the end by quoting:

Curved Air are a pioneering English progressive rock group formed in 1970 by musicians from mixed artistic backgrounds, including classical, folk, and electronic sound. The resulting sound of the band was a mixture of progressive rock, folk rock, and fusion with classical elements. Along with High Tide and East of Eden, Curved Air were one of the first rock bands after It's a Beautiful Day and the United States of America to feature a violin. Curved Air released eight studio albums, the first three of which broke the UK Top 20, and had a hit single with "Back Street Luv" (1971) which reached number 4 in the UK Singles Chart.
However, Darryl Way and Sonja Kristina remained interested in working together, and so Way brought in two more "Car Thieves", guitarist Mick Jacques and drummer Stewart Copeland. Though more members of this new lineup came from Stark Naked and the Car Thieves than Curved Air (Kristina being the only member not from the former band), they decided to adopt the Curved Air name for the same reasons that the Kristina/Wedgwood-led band had. With Darryl Way at the helm, this new band often employed the same classical and folk influences as the original band (and even played some of the original band's songs at their shows), but their core sound was rooted in pop, rhythm and blues, and hard rock. Miles Copeland III, still serving as Curved Air's manager, put the group on his own label, BTM. The band kicked off with a European tour, which started poorly. Way, a notorious perfectionist, grew impatient with the struggling of his bandmates, especially novice drummer Copeland. Then, for reasons no one could pinpoint, the musicians suddenly "clicked" with each other and the band caught fire, quickly becoming a popular and acclaimed live act. Their studio efforts were another story, however. Phil Kohn left and the band, unable to replace him in time for the sessions for Midnight Wire, relied on guest musicians to play both bass (John G Perry) and keyboards (Peter Wood). Norma Tager, a friend of Kristina's, penned the lyrics to the "Midnight Wire" songs. Kohn was later replaced by Tony Reeves, formerly of Colosseum and Greenslade, but the recording sessions for both Midnight Wire and 1976's Airborne were expensive and highly stressful for everyone involved. Both albums - as well as "Desiree", a single drawn from Airborne - failed to break the charts. Citing dissatisfaction with BTM Records' inability to support Curved Air financially, Way departed. Though Alex Richman from the Butts Band stepped in on keyboards, the loss of the band's de facto leader was a blow. This line-up's last-ditch attempt at a hit single, a cover version of "Baby Please Don't Go", was another flop. After months of gradually losing steam, Curved Air broke up so quietly that, by Sonja Kristina's recollections, most of the music press wrote off the band's absence as a "sabbatical". Copeland formed The Police, Reeves returned to work as a producer and played in semi-pro band Big Chief along with Jacques, and Kristina and Way both pursued solo careers. Kristina and Copeland maintained the close personal relationship they'd formed while bandmates and were married in 1982.

What did they do when they were unable to replace him?
relied on guest musicians to play both bass (John G Perry) and keyboards (Peter Wood).