Jordan Cherebetiu is alone in third place at 3-under-par 69.
This is the first year at the LPGA Final Qualifying Tournament will be a 90-hole, five-day event. The event takes place on both the Legends and Champions courses at LPGA International. The first 72 holes will be played on both courses, while the Legends course will host the final round.
Thirty exempt cards for the 2005 season are on the line as are 35 non-exempt spots.
Song, whose twin sister Aree was a rookie in 2004 and held the third-round lead of the Nabisco Championship, birdied her first, then reeled off three in a row starting at the fifth. She bogeyed 12, but rebounded with birdies at Nos. 13 and 14.
'One bogey, six birdies, it was a good day,' said Song, who won this year's The New Innsbrook CC Futures Golf Classic. 'I putted really well today. I made some long putts, short putts and medium putts. It was a good score.'
Bastel, a former All-American at Michigan State University, was flawless on Wednesday with five birdies, including back-to-back birdies at two and three and seven and eight, and zero bogeys.
'I was very consistent today,' said Bastel, who finished sixth on the Futures Tour money list, one spot from earning an exempt LPGA Tour card. 'Lots of fairways, lots of greens. Getting the putter rolling early is what helped me and gave me confidence for the rest of the round.'
Paula Creamer, an 18-year-old amateur, shot a 2-under 70 and is tied for fourth place with Kristen Samp, Michelle Simpson, Jenny Gleason, Janell Howland, Amy Hung and former LPGA Tour player Beth Bader.
Brittany Lincicome, 19, was the shocking first-round leader at this year's U.S. Women's Open. She posted an even-par 72 on Wednesday and is part of a group tied for 23rd with former tour members Becky Iverson, Tonya Gill and Leslie Spalding.
Maria Hjorth, a two-time winner in 1999, struggled to a 1-over 73 and is part of a logjam in 41st.
Charlotta Sorenstam, the sister of No. 1 player Annika, managed a 2-over-par 74 on Wednesday and is part of a huge group tied for 80th place. Virada Nirapathpongporn, the 2003 U.S. Women's Amateur champion, was two shots worse at plus-4.