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 The fight over tragic Nirvana frontman Kurt Cobain’s most priceless guitar is heading for a bitter, multimillion-dollar court battle. 
 
 Cobain’s daughter with Courtney Love, Frances Bean Cobain, has been trying to get the instrument — which her father played in Nirvana’s seminal 1993 “MTV Unplugged” concert — back from her estranged husband, Isaiah Silva, ever since they split in March 2016. 
 
 Silva, a musician in the band the Eeries, claims that in happier times, Frances Bean gave him the guitar — a Martin D-18E with the bridge flipped so that Kurt could play it left-handed — as a wedding present when they secretly married in 2014. It was once insured for $1 million, but experts say it is now likely worth several times that amount. 
 
 Frances Bean, who was not yet 2 years old when her father committed suicide in 1994, denies that she gifted it to Silva. 
 
 Love has said of the guitar — believed to be the last Kurt played before his death — “It’s not [Silva’s]. It’s a treasured heirloom of the family. It’s not his to take.” 
 
 The guitar is so valuable that Love’s manager has even allegedly sent a string of threatening messages to Silva’s ex-girlfriend in an attempt to get him to hand the historic instrument over. We’re told that after months of negotiation, Silva is still holding out and — according to Frances Bean’s side — is taking “extreme and unsupportable positions” on the disagreement. 
 
 “He is forcing the matter to litigation,” we’re told. Meanwhile, sources close to the struggle say it ended in a deadlock, and Frances Bean is ready to take the matter in front of a judge. 
 
 An insider tells us, “In September, a judge ordered Frances Bean to pay Silva $15,000 a month in spousal support as part of an interim settlement while they worked out the guitar issue through mediation.” 
 
 Reps for an attorney for Silva didn’t get back to us. ||||| Frances Bean Cobain‘s divorce may be settled but she has lost one prized possession to her ex: her father’s famous guitar. 
 
 Kurt Cobain’s daughter settled her divorce to ex Isaiah Silva on Monday in court documents obtained by PEOPLE. 
 
 The 25-year-old married Silva in 2014 and filed for divorce in March 2016. In November, a judge declared the daughter of the Nirvana frontman a single woman despite the fact that the two were still dividing their assets. 
 
 One point of contention between them: the iconic Martin guitar Cobain played during his MTV Unplugged performance in November 1993. Cobain died in the following year in April of suicide. 
 
 Silva claimed the model had given him the guitar as a present, while she denied ever giving it to him. In November, The Blast reported the guitar is worth millions of dollars. 
 
 Kurt Cobain in 1993's MTV Unplugged 
 
 Despite the artist’s request for the judge to keep the guitar in her family, Silva will get to keep it. 
 
 In documents filed at the time, Cobain stated Silva should not be entitled to any money from her father’s estate, which is valued at $450 million. 
 
 The filing asked that all premarital assets including Cobain’s inheritance be awarded to her as separate property. 
 
 RELATED: Frances Bean Cobain Is Officially Single but Is Fighting Ex for Guitar Belonging to Father Kurt 
 
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 Frances Bean Cobain and Isaiah Silva Splash 
 
 The artist has been dating Matthew Cook since last fall, sharing Instagram photos and videos of him during their time together. 
 
 In April, she shared her first original song on the anniversary of her father’s death in a snippet on Instagram. 
 
 “I think I saw you when I was small/ I think I found you/ A penny for your good thoughts,” she sings in a video. “I think I found you/ Jesus hangs in your place on the cross/ All these hinges become unscrewed / Heaven knows it was a cage on earth.” 
 
 Cobain also writes to a user in the comments section that the full song features “a very freaky deeky line that goes ‘stable sable sold her heart/ no one asks her why she hides it in a casket in her house in a box/ find a fiend who reigns supreme in may/ fast enough for blooming buds to lay their eggs.’” 
 
 Frances Bean Cobain Stefanie Keenan/Getty 
 
 When asked what the Nirvana frontman would think of her foray into songwriting, Frances offered an emotional and thoughtful response. 
 
 “I don’t have an answer for that because I don’t want to speak on someone else’s behalf,” she told E! News on the red carpet of the Daily Front Row Fashion Awards in Los Angeles in April. “I would hope that he would be proud of the human being I am even if he didn’t like the art I am putting out. That’s all I would ask of anyone in my life.” 
 
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 RELATED VIDEO: Frances Bean Cobain Reveals Her Private Battle with Addiction as She Celebrates 2 Years Sober 
 
 The multi-talented artist also expanded on where she plans to place her creative efforts. 
 
 “With regards to music, I don’t want to pigeonhole myself and say I am a musician or a visual artist because I feel like it’s all-encompassing and I feel like every bit of my art is related to the other,” she explained. “So do I want to pursue my music further and see it come to fruition and see something further and see something palpable? Absolutely.”
– A guitar that once belonged to Kurt Cobain, which is likely worth millions, is now in the hands of Eeries frontman Isaiah Silva, and Cobain's daughter is fighting to get it back in the family. Frances Bean Cobain was married to Silva for 21 months, and she's been trying to get the Martin D-18E (which had the bridge flipped so Cobain, a leftie, could play it comfortably) back ever since they split in March. Silva claims she gave it to him as a wedding gift and it's rightfully his. Now, the battle is headed to court, Page Six reports. "It’s not [Silva’s]. It’s a treasured heirloom of the family. It’s not his to take," Frances Cobain has said. But sources tell Page Six that Silva isn't giving in, and "is forcing the matter to litigation." The guitar, the one Cobain played during Nirvana's 1993 MTV Unplugged show and also thought to be the last one he played before taking his life, was once insured for $1 million but, per experts, is probably worth several times that now. Back in August, Silva requested $25,000 a month in spousal support and half of any money Frances made during the marriage, and said the couple had no prenup, TMZ reported. A judge has since ordered Frances Cobain to pay Silva $15,000 a month as part of an interim settlement.