Question: Who was a Scottish football player and Manchester United's manager, and described the title-winners of the 73rd season of the Football League as "...one of the First Division's most attractive sides..."?
Context: East Stirlingshire Football Club is a Scottish association football club from Falkirk.  The club was formed in 1881, with its origins traced to the previous year when a local cricket club from Bainsford formed a footballing section under the name Britannia.  After spending their first ten seasons solely participating in cup tournaments and friendlies, East Stirlingshire competed in regional leagues between 1891 and 1899, including the Central Football Combination and the Midland Football League.  In 1900, the club was elected to the second-tier of Scotland's main national league competition – the Scottish Football League.  The club remained in the Scottish Football League Division Two until 1914–15, when the league was suspended due to the outbreak of World War I.  The league was restarted in 1921–22 and after a solitary season in the third-tier in 1923–24, East Stirlingshire remained in the second-tier until 1932–33 when the club was promoted to the top-tier for the first time but were relegated after one season.  Between 1939 and 1955, the club spent only three seasons in the Scottish Football League after being refused entry to its second-tier after the end of World War II and did not join again until the 1955–56 when the number of teams in the league was expanded.  The club remained in the Scottish Football League until the 2012–13 season, when it merged with the Scottish Premier League to create a new governing body called the Scottish Professional Football League. 1893–94 in Scottish football was the 21st season of competitive football in Scotland and the fourth season of Scottish league football.  For the first time there were two divisions in the Scottish Football League, there was no automatic promotion and relegation but the bottom three clubs in Division One and the top three clubs in Division Two were subject to a vote of the remaining First Division clubs.  This season also saw the introduction of the Highland Football League. The 2012–13 Scottish Football League First Division, also known as the 2012–13 Irn Bru Scottish Football League First Division for sponsorship reasons, was the 18th season of the Scottish Football League First Division and the 107th season of a second-tier football league in Scotland.  Partick Thistle were confirmed as 2012–13 champions, on 20 April following their 2-0 win over Falkirk.  This was the final season of the First Division under its then format, as it was replaced by the Scottish Championship from the 2013–14 season onwards. The 2011–12 Scottish Football League First Division, also known as the 2011–12 Irn Bru Scottish Football League First Division for sponsorship reasons, is the 17th season of the Scottish First Division and the 106th season of a second-tier football league in Scotland.  Dunfermline Athletic are the current champions.  It began on 6 August 2011 and is scheduled to end on 5 May 2012. Following the cessation of hostilities in WW2, Scottish football got back to normal operations and therefore season 1946–47 was the 63rd Scottish football season in which Dumbarton competed at national level, entering the Scottish Football League for the 41st time and the Scottish Cup for the 52nd time.  In addition, Dumbarton entered two further competitions.  Following on from the successful format of the Southern League Cup during the war, the inaugural Scottish League Cup was played, and the Supplementary Cup competed for by B Division sides was continued for a second season. Sir Alexander Matthew Busby, CBE, KCSG (26 May 1909 – 20 January 1994) was a Scottish football player and manager, who managed Manchester United between 1945 and 1969 and again for the second half of the 1970–71 season.  He is widely regarded as one of the greatest managers of all time.  His managerial records and longevity at the helm of Manchester United are surpassed only by Sir Alex Ferguson. Inverness Caledonian Thistle F.C. in their tenth season in the Scottish Football League competed in the Scottish First Division, Scottish League Cup, Scottish Challenge Cup and the Scottish Cup in season 2003–04.  This season has been to most successful as of 2012.  They won their first major trophy when they won the Challenge Cup beating Airdrie United in the final 2-0 with goals from Steve Hislop and David Bingham, and at the end of the season, they won the First Division Championship and securing promotion to the Scottish Premier League.  However, SPL rules at that time stated that all member clubs must have a stadium with a minimum capacity of 10,000 seats.  Caledonian Stadium did not and this left the club's board with a dilemma: either to stay in the First Division like Falkirk the previous season or to groundshare with Aberdeen's Pittodrie Stadium, over 100 miles (160 km) away.  After consulting with supporters, the board decided the sacrifice of one season in Aberdeen would be worthwhile for Premier League football. The 1974–75 season was Manchester United's 73rd season in the Football League, and their first as a Second Division team since 1937–38, following relegation from the First Division at the end of the previous season The 1961–62 season was the 73rd season of competitive football played by Ipswich Town.  Although the club exited both the FA Cup and the Football League Cup in the fourth round, they ended the campaign as Football League champions, becoming the third club to win back-to-back Second and First Division titles.  Matt Busby described the title-winners as "...one of the First Division's most attractive sides...".  As league champions, Ipswich qualified for European football for the first time in the club's history. Celtic Football Club is a professional association football club based Glasgow, Scotland.  The club was founded in 1887 and began playing league football in 1890 as founder members of the Scottish Football League.  Since their first season Celtic have remained in the top division of the Scottish football league system: the Scottish Football League (1890–93), Scottish Football League Division One (1893–1975), Scottish Football League Premier Division (1975–98), Scottish Premier League (1998–2013) and Scottish Premiership (2013–present).  As of 2015–16 the club has completed 127 seasons of competitive football and have been Scottish football champions 47 times.
Answer: Matt Busby