Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Song | Artist(s) | Concert | Film | 1978 album | 2002 album |
| --- | --- | --- | --- | --- | --- |
| "Up on Cripple Creek" | The Band | 1 | 3 | 2 | 2 |
| "The Shape I'm In" | The Band | 2 | 4 | 14 | 3 |
| "It Makes No Difference" | The Band | 3 | 6 | 8 | 4 |
| "Life is a Carnival" | The Band | 4 | - | 19 | 6 |
| "This Wheel's on Fire" | The Band | 5 | - | - | 10 |
| "W.S. Walcott Medicine Show" | The Band | 6 | - | - | 26 |
| "Georgia on My Mind" | The Band | 7 | - | - | - |
| "Ophelia" | The Band | 8 | 20 | 16 | 18 |
| "King Harvest (Has Surely Come)" | The Band | 9 | - | - | - |
| "The Night They Drove Old Dixie Down" | The Band | 10 | 12 | 10 | 29 |
| "Stage Fright" | The Band | 11 | 10 | 5 | 14 |
| "Rag Mama Rag" | The Band | 12 | - | - | 15 |
| "Who Do You Love?" | Ronnie Hawkins | 13 | 5 | 3 | 5 |
| "Such a Night" | Dr. John | 14 | 8 | 9 | 7 |
| "Down South in New Orleans" | Bobby Charles and Dr. John | 15 | - | 15 | 9 |
| "Mystery Train" | Paul Butterfield | 16 | 15 | 11 | 11 |
| "Caldonia" | Muddy Waters | 17 | - | - | 12 |
| "Mannish Boy" | Muddy Waters | 18 | 16 | 12 | 13 |
| "All Our Past Times" | Eric Clapton | 19 | - | - | 16 |
| "Further on Up the Road" | Eric Clapton | 20 | 17 | 13 | 17 |
| "Helpless" | Neil Young | 21 | 9 | 4 | 19 |
| "Four Strong Winds" | Neil Young | 22 | - | - | 20 |
| "Coyote" | Joni Mitchell | 23 | 14 | 6 | 21 |
| "Shadows and Light" | Joni Mitchell | 24 | - | - | 22 |
| "Furry Sings the Blues" | Joni Mitchell | 25 | - | - | 23 |
| "Dry Your Eyes" | Neil Diamond | 26 | 13 | 7 | 25 |
| "Tura Lura Lural (That's an Irish Lullaby)" | Van Morrison | 27 | - | 17 | 27 |
| "Caravan" | Van Morrison | 28 | 21 | 18 | 28 |
| "Acadian Driftwood" | The Band, Neil Young and Joni Mitchell | 29 | - | - | 24 |
| "Genetic Method"/"Chest Fever" | The Band | 30 | 19 | - | 30 |
| "The Last Waltz Suite: Evangeline" (concert version) | The Band | 31 | - | - | - |
| "The Weight" (concert version) | The Band | 32 | - | - | 8 |
| "Baby, Let Me Follow You Down" | Bob Dylan | 33 | - | 20 | 31 |
| "Hazel" | Bob Dylan | 34 | - | - | 32 |
| "I Don't Believe You" | Bob Dylan | 35 | - | 21 | 33 |
| "Forever Young" | Bob Dylan | 36 | 23 | 22 | 34 |
| "Baby, Let Me Follow You Down" (reprise) | Bob Dylan | 37 | 24 | 23 | 35 |
| "I Shall Be Released" | Bob Dylan and The Band, with guests (including Ronnie Wood and Ringo Starr) | 38 | 25 | 24 | 36 |
| "Jam #1" | Neil Young, Ronnie Wood, Eric Clapton, Robbie Robertson, Paul Butterfield, Dr. John, Garth Hudson, Rick Danko, Ringo Starr and Levon Helm | 39 | - | - | 37 |
| "Jam #2" | Neil Young, Ronnie Wood, Eric Clapton, Stephen Stills, Paul Butterfield, Dr. John, Garth Hudson, Carl Radle, Ringo Starr and Levon Helm | 40 | - | - | 38 |
| "Don't Do It" | The Band | 41 | 1 | - | 39 |
| "Theme from The Last Waltz" (studio) | The Band | - | 2 | 1 | 1 |
| "Greensleeves" | The Band | 42 | - | - | 40 |
| Introduction to The Canterbury Tales in Chaucerian dialect | Michael McClure | - | 7 | - | - |
| "The Weight" (studio version) | The Band and The Staple Singers | - | 11 | 29 | 44 |
| "Evangeline" (studio version) | The Band and Emmylou Harris | - | 18 | 27 | - |
| "Loud Prayer" | Lawrence Ferlinghetti | - | 22 | - | - |
Question:
how many songs did joni mitchell perform?
Answer:
4