Most western nationalities do not require a visa, you will get issued 14 or 30 days on arrival.
Nationals from: Afghanistan, Algeria, Bangladesh, Commonwealth of Independent States, Egypt, India, Iran, Iraq, Jordan, Lebanon, Libya, Morocc,o Myanmar, People's Republic of China, Pakistan, Saudi Arabia, Somalia, Sudan, Syria, Tunisia, Yemen
Will need to organise a visa in advance.
Visa Requirements In Singapore
Singapore Embassies
Foreign Embassies In Singapore