If the visit is between the middle of May and October, you will be able to visit concerts and weekend music festivals free of cost. There is Chicago Gospel Music Festival which starts in the early days of June, the visit of which is free.

Chicago also hosts indoor concerts through out the year at Chicago cultural center. There are several bars and night clubs which do not charge to have drinks.

To know more about the free concerts in Chicago, please log on to the following websites:

http://www.guardian.co.uk/travel/2009/oct/16/top-10-free-chicago

http://www.explorechicago.org/city/en/things_see_do/event_landing/special_events/dca_tourism/Chicago_SummerDance.html

There are lots of air tour services to be found there in Chicago, IL. Some of the air tour services there in Chicago, IL are:

Mena travels and tours is the station that is offering the air tour service since 50 years. They offer all experienced and well trained staff for the air tours you request. They also will be there 24 hours for the service in Chicago, IL.

http://www.dexknows.com/business_profiles/mena_travel_and_tours-b182179

Sanjuan star travel is one of the fine air travels offering service there in Chicago, IL. One can book the tickets for the air tour in the site that is supplied in here.

http://www.sanjuanstartravel.com/

To learn more about these air tour services available there in Chicago, IL, please visit the link mentioned in here:

http://yellowpages.superpages.com/listings.jsp?CS=L&MCBP=true&C=air+tours&STYPE=S&L=Chicago+IL&search.x=23&search.y=13&search=Find+It&search=Find+It