-star lineup gathers in honor of legendary singer/songwriter joni mitchell to celebrate her 75th birthday, performing songs that span her groundbreaking career. -♪ give me spots on my apples ♪s ut leave me the birdd the bees ♪ -join us for a heartfelt tribute to mitchell's incomparable musical artistry and enduring influence. -thank you, joni. -"joni 75: a birthday celebration" is next. "great performances" is brought to you by the joseph and robert cornell memorial foundation, supporting tio arts and educat ♪ ♪

the cost of just maintaining them never mind restoring them and you know it is slightly like a joni mitchellsong you don't know where it lost it's gone you know now suddenly people are realizing you know just how critical these golding's are to our sense of history our sense of culture particularly for the french nation. lisa riley is so she had professor of medieval art in architecture at the university of virginia professor rather we appreciate you taking the time to talk with us and sharing your insights thank you thank you. we here in germany very growing criticism of how the state treats migrants who are seeking asylum in twenty eighteen authorities say they considered more than two hundred thousand applications for silent more than a third were rejected but before a decision is ever made migrants can spend weeks or months in what are called holding centers need to be used as a clora valter reports on those centers from the very insulting. behind this fence nice to fill some slowpoke refugee camp where putas are not allowed inside so forth the residents meet us here because they fear of

>> every great songwriter, came through, jackson brown, j.d., henley and frey, linda ronstadt, joni mitchellxpressing themselves. >> is it difficult to reveal it constantly to so many people. why do you do this? >> i feel an obligation to people and to myself to share myself maybe as honestly as i can. ♪ i left my folk and friends with the aim to clear my mind out ♪ ♪ well i hit the rowdy road and many kinds i met there many stories told all the ways to get there ♪ ♪ ooh ♪ so on and on i go ♪ the seconds tick the time out ♪ ♪ and there's so much left to know ♪ ♪ well i'm on the road to find out ♪ >> everyone was just trying to do whatever came into their head. >> in the early days paul and i we wanted to be the group from england. they were very big those days. >> we had no idea who the people were, the mysterious mr. king was. wrote the songs, chains the beatles did, i'm into something good. we did discover this remarkable woman, carole king. >> carole king made the transition from being behind the scenes woman to a star in her own right. ♪ i feel the earth move under my feet and i feel the

. >>> remember joni mitchell lyrics they paved paradise and spoke about put up a parking lot? that could be the official fight song for a battle brewing in menlo park tonight. environmental activists are trying to stop the city from chopping down a group of redwood trees downtown. kiet do explains why those trees are in jeopardy. >> activists are taking the chance to remind the public that for these trees in menlo park this could be the beginning of the end. >> reporter: they are eight stories tall and have stood here at the corner of el camino and ravenswood for nearly 40 years. but, in 16 days the menlo park city council will vote to decide their fate. environment collectivist judy rodeo is trying to save them. >> i am feeling positive and hopeful. i'm feeling hopeful. >> reporter: the positive is -- problem is with the underground parking structure next to the trees. an underground membrane has failed allowing water to seep through the walls. the cheapest way to fix it would be to take a 4 foot wide trench along the opposite side of the wall and replaced the membrane. howev