All Right Now has been mentioned, but honestly, Andy Fraser has some way more interesting bass lines, including:
Mr. Big
Remember
Trouble on Double Time
Sugar for Mr. Morrison
Woman
Actually, pretty much any Free song has a great bassline. Seriously, the guy is fantastic. I've learned a lot from listening to and learning his lines.
I'm about to drop a heck of a list. These are just songs I think are great ones to practice for variety and keeping up chops:
Whipping Post: Allman Brothers Band
Good Vibrations - Beach Boys
Something - The Beatles
Eight Days a Week - The Beatles
Paperback Writer - The Beatles
I Saw Her Standing There - The Beatles
All My Loving - The Beatles
Fairies Wear Boots - Black Sabbath
War Pigs - Black Sabbath
I'm a Man - Chicago Transit Authority
Sunshine of Your Love - Cream
Born Under a Bad Sign - Albert King/Cream
Susie Q - CCR
Highway Star - Deep Purple
Disco Strangler - The Eagles
Heartbreak Hotel - Elvis (actually, there's so much Elvis that's great, I spent a LOT of time learning most of the songs off of Elvis 30 #1 Hits)
Stay With Me - The Faces
Shake It- Five Corners Quintet (Hot Corner is a fantastic album)
I Just Want To Make Love To You - Foghat
The entire Live: 1971 Tour album by Grand Funk (one of my all time play along favorites)
The Love You Save - Jackson 5
ABC - Jackson 5
Funk #49 - James Gang
The Hangman's Knee - The Jeff Beck Group
Spanish Boots - The Jeff Beck Group
3/5ths of a Mile in 10 seconds (off Bless its Pointed Little Head) - Jefferson Airplane
Power of Soul - Jimi Hendrix (Live at The Fillmore East)
Manic Depression - The Jimi Hendrix Experience
Traveling Riverside Blues - Led Zeppelin
What is and What Should Never Be - Led Zeppelin
Good Times Bad Times - Led Zeppelin
Ramble on - Led Zeppelin
Hots for Nowhere - Led Zeppelin
Workin' for MCA - Lynyrd Skynyrd
Cissy Strut - The Meters
Nantucket Sleighride - Mountain
Never in My Life - Mountain
Brontosaurus - The Move
Mannish Boy - Muddy Waters (find the Electric Mud album, that version)
Young Lust - Pink Floyd
Space Invader - The Pretenders
The Millionaire Waltz - Queen
Steady as She Goes - The Raconteurs (Consolers of a Lonely Heart, the album, also has lots of great lines)
I Just Want To Celebrate - Rare Earth
I Know I'm Losing You - Rod Stewart
Sympathy for the Devil - Rolling Stones
Under My Thumb - Rolling Stones
Reptilian Blues - Rose Hill Drive
Working Man - Rush
Anthem - Rush
Soul Sacrifice - Santana (especially the Woodstock version)
Mrs. Robinson - Simon & Garfunkel
Dragonaut - Sleep
Sing a Simple Song - Sly & the Family Stone
Livin' in the USA - Steve Miller
Jungle Love - Steve Miller
Couldn't Stand the Weather - Stevie Ray Vaughn
Sir Duke - Stevie Wonder
I was Made To Lover Her - Stevie Wonder
Ball of Confusion - The Temptations
Shaky Ground - The Temptations
The Stomp - Ten Years After
Pinball Wizard - The Who
Substitute - The Who
Where Eagles Have Been - Wolfmother
Love Train - Wolfmother
Roundabout - Yes
Precious and Grace - ZZ Top
Tube Snake Boogie - ZZ Top